btrfs: release root after error in data_reloc_print_warning_inode()

data_reloc_print_warning_inode() calls btrfs_get_fs_root() to obtain
local_root, but fails to release its reference when paths_from_inode()
returns an error. This causes a potential memory leak.

Add a missing btrfs_put_root() call in the error path to properly
decrease the reference count of local_root.

Fixes: b9a9a85 ("btrfs: output affected files when relocation fails")
CC: [email protected] # 6.6+
Reviewed-by: Qu Wenruo <[email protected]>
Signed-off-by: Zilin Guan <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: GoodLuck612

fs/btrfs/inode.c

@@ -178,8 +178,10 @@ static int data_reloc_print_warning_inode(u64 inum, u64 offset, u64 num_bytes,
 		return ret;
 	}
 	ret = paths_from_inode(inum, ipath);
-	if (ret < 0)
+	if (ret < 0) {
+		btrfs_put_root(local_root);
 		goto err;
+	}
 
 	/*
 	 * We deliberately ignore the bit ipath might have been too small to