VFS: Remove dependency of ->umount_begin() call on MNT_FORCE

Allow filesystems to decide to perform pre-umount processing whether or not
MNT_FORCE is set.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/namespace.c b/fs/namespace.c
index b22e469..6bb0b85 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -576,8 +576,8 @@
 	 */
 
 	lock_kernel();
-	if ((flags & MNT_FORCE) && sb->s_op->umount_begin)
-		sb->s_op->umount_begin(sb);
+	if (sb->s_op->umount_begin)
+		sb->s_op->umount_begin(mnt, flags);
 	unlock_kernel();
 
 	/*