Remove useless ifdef KLD_MODULE from dummynet module unload path. This
fixes panic on unload.

Reported by:	pho


git-svn-id: svn://svn.freebsd.org/base/head@250039 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Merge remote-tracking branch 'upstream/master'