unix_serial_passthrough.c: check errno for EWOULDBLOCK #4199
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plat_serpt_write_vcon(): write() returns how much data it has written to the file descriptor, and in case an error, it returns -1. So the EWOULDBLOCK never really triggers, as in the following condition we're not checking the errno, but the return value of the write() function.
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Summary
plat_serpt_write_vcon(): write() returns how much data it has written to the file descriptor, and in case an error, it returns -1. So the EWOULDBLOCK never really triggers, as in the following condition we're not checking the errno, but the return value of the write() function.
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