Convert obvious places to deactivate_locked_super()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 355e0ef..5e6d358 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -602,8 +602,7 @@
 
 	rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 	if (rc) {
-		up_write(&sb->s_umount);
-		deactivate_super(sb);
+		deactivate_locked_super(sb);
 		return rc;
 	}
 	sb->s_flags |= MS_ACTIVE;