line-log: avoid memory leak

Discovered by Coverity.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

line-log.c

@@ -1125,6 +1125,7 @@ static int process_ranges_ordinary_commit(struct rev_info *rev, struct commit *c
 	changed = process_all_files(&parent_range, rev, &queue, range);
 	if (parent)
 		add_line_range(rev, parent, parent_range);
+	free_line_log_data(parent_range);
 	return changed;
 }