* * pointer illegal access to out-of-scope stack pointer
the following line_number_expansion is stack pointer:

char line_number_expansion[10];

and it has already been out-of-scope in the following
access, which may cause unintended program behaviors:

size_t n = strlen(token_expansion);
...
memcpy(output_buffer + old_output_buffer_len, token_expansion, n + 1);

Signed-off-by: Ethan Gao <ethan.gao@linux.intel.com>

* comment fixup

Document rmw_wait

raise warning level