btrfs: merge free_fs_info() calls on fill_super failures

... all the way up into btrfs_mount().
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/btrfs/disk-io.c

@@ -2427,7 +2427,6 @@ int open_ctree(struct super_block *sb,
 		up_read(&fs_info->cleanup_work_sem);
 		if (err) {
 			close_ctree(tree_root);
-			free_fs_info(fs_info);
 			return err;
 		}
 	}
@@ -2478,7 +2477,6 @@ int open_ctree(struct super_block *sb,
 	cleanup_srcu_struct(&fs_info->subvol_srcu);
 fail:
 	btrfs_close_devices(fs_info->fs_devices);
-	free_fs_info(fs_info);
 	return err;
 
 recovery_tree_root:

fs/btrfs/super.c

@@ -634,7 +634,6 @@ static int btrfs_fill_super(struct super_block *sb,
 
 fail_close:
 	close_ctree(tree_root);
-	free_fs_info(fs_info);
 	return err;
 }
 
@@ -947,6 +946,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
 		error = btrfs_fill_super(s, fs_devices, data,
 					 flags & MS_SILENT ? 1 : 0);
 		if (error) {
+			free_fs_info(fs_info);
 			deactivate_locked_super(s);
 			return ERR_PTR(error);
 		}