ERR_remove_state — free a thread's error queue
ERR_remove_state(unsigned long pid);
ERR_remove_state() frees the error queue associated with thread pid.
If pid == 0, the current thread will have its
error queue removed.
Since error queue data structures are allocated automatically
for new threads, they must be freed when threads are terminated
in order to avoid memory leaks.
ERR_remove_state() returns no value.
ERR_remove_state() is available in all versions of SSLeay