btrfs: make open_ctree() return int

It returns either ERR_PTR(-ve) or sb->s_fs_info.  The latter can
be found by caller just as well, TYVM, no need to return it.  Just
return -ve or 0...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 9308c7f..78247522 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1880,9 +1880,9 @@
 }
 
 
-struct btrfs_root *open_ctree(struct super_block *sb,
-			      struct btrfs_fs_devices *fs_devices,
-			      char *options)
+int open_ctree(struct super_block *sb,
+	       struct btrfs_fs_devices *fs_devices,
+	       char *options)
 {
 	u32 sectorsize;
 	u32 nodesize;
@@ -2428,11 +2428,11 @@
 		if (err) {
 			close_ctree(tree_root);
 			free_fs_info(fs_info);
-			return ERR_PTR(err);
+			return err;
 		}
 	}
 
-	return tree_root;
+	return 0;
 
 fail_trans_kthread:
 	kthread_stop(fs_info->transaction_kthread);
@@ -2479,7 +2479,7 @@
 fail:
 	btrfs_close_devices(fs_info->fs_devices);
 	free_fs_info(fs_info);
-	return ERR_PTR(err);
+	return err;
 
 recovery_tree_root:
 	if (!btrfs_test_opt(tree_root, RECOVERY))