Initialize reserved bytes in struct mq_attr and its 32compat
counterpart, to avoid kernel stack content leak in kmq_setattr(2)
syscall. Also slightly simplify the checks around copyout()s.
Reported by: Vlad Tsyrklevich <vlad902+spam@gmail.com>
PR: 214488
MFC after: 1 week
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head/sys/kern/uipc_mqueue.c