fusefs: fix intermittency in the dev_fuse_poll test

fusefs: fix intermittency in the dev_fuse_poll test

The DevFusePoll::access/select test would occasionally segfault.  The
cause was a file descriptor that was shared between two threads.  The
first thread would kill the second and close the file descriptor.  But
it was possible that the second would read the file descriptor before it
shut down.  That did not cause problems for kqueue, poll, or blocking
operation, but it triggered segfaults in select's macros.

Differential Revision: https://reviews.freebsd.org/D32142

(cherry picked from commit f44a448709d3b77508fd59ee28201ae1666387c2)