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Revert "kqueue: on process exit, force-clear its registered signal events"

Description

Revert "kqueue: on process exit, force-clear its registered signal events"

This reverts commit 393ac29f0b8be068c8e46f76c2eeee07d20ea4df. A
different fix is following, which preserves semantic, required by the
sys.kqueue.proc3_test.proc3 test.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
PR: 275286
Differential revision: https://reviews.freebsd.org/D42777