ufs: make ufs_freespace() return signed

as it is, checking that its return value is <= 0 is useless and
that's how it's being used.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-06-14 15:36:31 -04:00
commit fffd70f588