Minor code styling.

Suggested by:	glebius @


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272595 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
devfs: don't take proctree_lock unconditionally in devfs_close

MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272596 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f