[Bug 240022] sem_wait broken by r350481

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240022

            Bug ID: 240022
           Summary: sem_wait broken by r350481
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: threads
          Assignee: threads at FreeBSD.org
          Reporter: andrew at tao11.riddles.org.uk
                CC: kib at FreeBSD.org, tmunro at FreeBSD.org

r350481 confuses _pthread_cancel_enter and _thr_cancel_enter, which take
different parameters (int vs. struct pthread *). The result is that sem_wait,
which calls _pthread_cancel_enter(1), segfaults because it ends up in
_thr_cancel_enter(1).

This breaks postgresql (easily reproduced by running regression tests) though
it ought to be easily testable otherwise. (Originally reported to me by tmunro)

Affects current and 12-stable.

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