[PATCH] Rearrange error handling in fs_pipe.c a bit

From:  Scharfe <l.s.r@web.de>

  clean up the error handling in pipefs a little bit,
  shrinking pipe.o by whopping 4 bytes! :)

fs/pipe.c

@@ -641,11 +641,10 @@ static int __init init_pipe_fs(void)
 	int err = register_filesystem(&pipe_fs_type);
 	if (!err) {
 		pipe_mnt = kern_mount(&pipe_fs_type);
-		err = PTR_ERR(pipe_mnt);
-		if (IS_ERR(pipe_mnt))
+		if (IS_ERR(pipe_mnt)) {
+			err = PTR_ERR(pipe_mnt);
 			unregister_filesystem(&pipe_fs_type);
-		else
-			err = 0;
+		}
 	}
 	return err;
 }