POSIX says SEM_FAILED shall have type sem_t*.
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/semaphore.h.html (Even if it didn't, this header previously referred to NULL without ensuring that NULL was actually visible.) Change-Id: I70577f4afc21f32c9e585076986127899ef8c8c1
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