K 10
svn:author
V 3
bjk
K 8
svn:date
V 27
2014-05-21T03:11:27.032844Z
K 7
svn:log
V 359
Check for mismatched vref()/vdrop()

Assert that the hold count has not fallen below the use count, a situation
that would only happen when a vref() (or similar) is erroneously paired
with a vdrop().  This situation has not been observed in the wild, but
could be helpful for someone implementing a new filesystem.

Reviewed by:	kib
Approved by:	hrs (mentor)

END