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sysv_sem waiter counting bug

If semop() returns EINTR, semptr->sem[nz]cnt is not properly
decremented.  The FreeBSD patch which fixes this should apply
to OpenBSD:

http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/kern/sysv_sem.c.diff?r1=1.68&r2=1.69

Colin Percival