[XFS] Fix a bad pointer dereference in the quota statvfs handling.

SGI-PV: 955993
SGI-Modid: xfs-linux-melb:xfs-kern:26934a
Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: David Chatterton <chatz@sgi.com>

fs/xfs/quota/xfs_qm_bhv.c

@@ -203,7 +203,7 @@ xfs_qm_statvfs(
 	if (error || !vnode)
 		return error;
 
-	mp = XFS_BHVTOM(bhv);
+	mp = xfs_vfstom(bhvtovfs(bhv));
 	ip = xfs_vtoi(vnode);
 
 	if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))