Dmitry Chagin 89ecdff2c3 Fix sigtimedwait manpage.
Historically, sigtimedwait() blocks indefinitely if timeout is NULL.

Reviewed by:		jilles, imp
Differential Revision:	https://reviews.freebsd.org/D34985
MFC after:		2 weeks
2022-04-21 10:52:29 +03:00
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