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If btrfs_read_fs_root() fails with -ENOENT, then we go to the next entry. Fine. But if it fails for a different reason then we need to clean up and return an error code. In the current code it doesn't clean up but instead dereferences "root" and crashes. Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Marek Behún <kabel@kernel.org> Reviewed-by: Qu Wenruo <wqu@suse.com>