filter: make sure to close the stream even on error

When the stream list init or write fail, we must also make sure to close
the stream, as that's the function contract.

src/filter.c

@@ -947,18 +947,20 @@ int git_filter_list_stream_data(
 {
 	git_vector filter_streams = GIT_VECTOR_INIT;
 	git_writestream *stream_start;
-	int error = 0;
+	int error = 0, close_error;
 
 	git_buf_sanitize(data);
 
-	if ((error = stream_list_init(
-			&stream_start, &filter_streams, filters, target)) == 0 &&
-		(error =
-			stream_start->write(stream_start, data->ptr, data->size)) == 0)
-		error = stream_start->close(stream_start);
+	if ((error = stream_list_init(&stream_start, &filter_streams, filters, target)) < 0)
+		goto out;
 
+	error = stream_start->write(stream_start, data->ptr, data->size);
+
+out:
+	close_error = stream_start->close(stream_start);
 	stream_list_free(&filter_streams);
-	return error;
+	/* propagate the stream init or write error */
+	return error < 0 ? error : close_error;
 }
 
 int git_filter_list_stream_blob(