Konstantin Belousov 0f2d97838d In both do_rw_wrlock() and do_rw_rdlock() after r304808, do not
obliterate possible error from sleep with errors from
umtxq_check_susp(), when looping to clear URWLOCK_{READ,WRITE}_WAITERS.

Noted and reviewed by:	vangyzen
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2016-08-25 19:15:02 +00:00
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