K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2017-04-30T19:32:51.446944Z
K 7
svn:log
V 322
Restructure normal (non-error) control flow in sem_close().

Do not retest for the found semaphore after the loop to look it up.
Instead, handle both cases of last and non-last close simultaneously,
which allows to consolidate the list unlock and successful return.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END