Konstantin Belousov 12c81769b6 Avoid bind lock recursion.
When dlclose(3) unloads an object with filtees, it recursively calls
dlclose(3) on each filtee in free_needed_filtees().  Introduce
dlclose_locked() helper, called from free_needed_filtees() instead of
dlclose(), and pass the bind lockstate down to avoid recursing.

Reported and tested by:	jhibbits
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
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