btrfs-progs: tune: reset fs_info->new_chunk_tree_uuid at the end

The CodeQL scan points out a local variable is stored in a non-local
memory, in this case it's the uuid buffer for new chunk. There are error
paths leading to the label 'out' that do not reset it. This is not a
problem as this does not leak outside, but let's reset it in all cases.

Signed-off-by: David Sterba <[email protected]>

Author: kdave

tune/change-uuid.c

@@ -300,9 +300,9 @@ int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str)
 	/* Now fsid change is done */
 	pr_verbose(LOG_DEFAULT, "Clear superblock flag CHANGING_FSID\n");
 	ret = change_fsid_done(fs_info);
-	fs_info->new_chunk_tree_uuid = NULL;
 	pr_verbose(LOG_DEFAULT, "Fsid change finished\n");
 out:
+	fs_info->new_chunk_tree_uuid = NULL;
 	return ret;
 }