Mechanically convert to if_inc_counter().


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271849 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Fix typo.

Submitted by:	jkim


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271850 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f