Fix nused counter. It's currently getting set to -1 rather than getting
decremented by 1. Since nused never reaches 0, the "if (!free->hdr.nused)"
check in xfs_dir2_leafn_remove() fails every time and xfs_dir2_shrink_inode()
doesn't get called when it should. This causes extra blocks to be left on
an empty directory and the directory in unable to be converted back to
inline extent mode.
Signed-off-by: Mandy Kirkconnell <alkirkco@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>