still leak at 0.12.5 with CentOS 7 64bit

below is test case code of memory leak when call wkhtmltoimage_convert() function.

//1. create test.html
//   echo foo > test.html
//
//2. compile test.c
//   gcc pdf_c_api.c -o pdf_c_api -std=gnu99 -lwkhtmltox;
//
//
//------------------------------
// modified from examples/pdf_c_api.c
//------------------------------


#include <stdbool.h>
#include <stdio.h>
#include <wkhtmltox/pdf.h>
#include <unistd.h>

/* Print out loading progress information */
void progress_changed(wkhtmltopdf_converter * c, int p) {
	printf("%3d%%\r",p);
	fflush(stdout);
}

/* Print loading phase information */
void phase_changed(wkhtmltopdf_converter * c) {
	int phase = wkhtmltopdf_current_phase(c);
	printf("%s\n", wkhtmltopdf_phase_description(c, phase));
}

/* Print a message to stderr when an error occures */
void error(wkhtmltopdf_converter * c, const char * msg) {
	fprintf(stderr, "Error: %s\n", msg);
}

/* Print a message to stderr when a warning is issued */
void warning(wkhtmltopdf_converter * c, const char * msg) {
	fprintf(stderr, "Warning: %s\n", msg);
}

/* Main method convert pdf */
//int main() {
int main1() {
	wkhtmltopdf_global_settings * gs;
	wkhtmltopdf_object_settings * os;
	wkhtmltopdf_converter * c;

	/* Init wkhtmltopdf in graphics less mode */
	wkhtmltopdf_init(false);

	/*
 * 	 * Create a global settings object used to store options that are not
 * 	 	 * related to input objects, note that control of this object is parsed to
 * 	 	 	 * the converter later, which is then responsible for freeing it
 * 	 	 	 	 */
	gs = wkhtmltopdf_create_global_settings();
	/* We want the result to be storred in the file called test.pdf */
	wkhtmltopdf_set_global_setting(gs, "out", "test.pdf");

	wkhtmltopdf_set_global_setting(gs, "load.cookieJar", "myjar.jar");
	/*
 * 	 * Create a input object settings object that is used to store settings
 * 	 	 * related to a input object, note again that control of this object is parsed to
 * 	 	 	 * the converter later, which is then responsible for freeing it
 * 	 	 	 	 */
	os = wkhtmltopdf_create_object_settings();
	/* We want to convert to convert the qstring documentation page */
	wkhtmltopdf_set_object_setting(os, "page", "test.html");

	/* Create the actual converter object used to convert the pages */
	c = wkhtmltopdf_create_converter(gs);

	/* Call the progress_changed function when progress changes */
	wkhtmltopdf_set_progress_changed_callback(c, progress_changed);

	/* Call the phase _changed function when the phase changes */
	wkhtmltopdf_set_phase_changed_callback(c, phase_changed);

	/* Call the error function when an error occures */
	wkhtmltopdf_set_error_callback(c, error);

	/* Call the waring function when a warning is issued */
	wkhtmltopdf_set_warning_callback(c, warning);

	/*
 * 	 * Add the the settings object describing the qstring documentation page
 * 	 	 * to the list of pages to convert. Objects are converted in the order in which
 * 	 	 	 * they are added
 * 	 	 	 	 */
	wkhtmltopdf_add_object(c, os, NULL);

	/* Perform the actual convertion */
	if (!wkhtmltopdf_convert(c))
		fprintf(stderr, "Convertion failed!");

	/* Output possible http error code encountered */
	printf("httpErrorCode: %d\n", wkhtmltopdf_http_error_code(c));

	/* Destroy the converter object since we are done with it */
	wkhtmltopdf_destroy_converter(c);

	/* We will no longer be needing wkhtmltopdf funcionality */
	wkhtmltopdf_deinit();

	return 0;
}

void print_memory(){
	char cmd[100];
	sprintf (cmd,"ps -e -o 'pid: %%p rss: ' -orss -o'KB vsz: %%zKB' | grep ' %i ' | grep -v grep", getpid());

	char pout[1000];
	int pos = 0;
	char p;
	FILE *stream = popen(cmd,"r");
	while((p=fgetc(stream)) != EOF){
		pout[pos] = p;
		pos++;
	}
	pout[pos] = '\0';
	pclose(stream);  
	printf("%sany key to continue, [ctrl-c] to exit\n",pout);
}

int main(){
	while(1){
		main1();
		print_memory();
		getchar();
	}
}

run pdf_c_api and it will produce output below.
rss and vsz will increase on every loop

bash# ./pdf_c_api

Loading pages
Counting pages
Resolving links
Loading headers and footers
Printing pages
Done
httpErrorCode: 0
pid: 18427 rss: 19040KB vsz: 311096KB
any key to continue, [ctrl-c] to exit

Loading pages
Counting pages
Resolving links
Loading headers and footers
Printing pages
Done
httpErrorCode: 0
pid: 18427 rss: 19096KB vsz: 311112KB
any key to continue, [ctrl-c] to exit

Loading pages
Counting pages
Resolving links
Loading headers and footers
Printing pages
Done
httpErrorCode: 0
pid: 18427 rss: 19168KB vsz: 311160KB
any key to continue, [ctrl-c] to exit

Loading pages
Counting pages
Resolving links
Loading headers and footers
Printing pages
Done
httpErrorCode: 0
pid: 18427 rss: 19244KB vsz: 311216KB
any key to continue, [ctrl-c] to exit

Loading pages
Counting pages
Resolving links
Loading headers and footers
Printing pages
Done
httpErrorCode: 0
pid: 18427 rss: 19364KB vsz: 311320KB
any key to continue, [ctrl-c] to exit

wkhtmltoimage_convert() memory leak #2700

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