Missed in r274421: use sbavail() instead of bare access to sb_cc.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275320 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Remove extra labels, ENTRY_NP already provides them.

Sponsored by:	ABT Systems Ltd


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275321 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f