K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2018-01-12T13:39:02.168449Z
K 7
svn:log
V 222
vfs: tidy up vdrop

Skip vfs_refcount_release_if_not_last if the interlock is held and just
go straight to refcount_release.

While here do cosmetic rearrangement of _vhold to better show it contains
equivalent behaviour.

END