revisions API: release "reflog_info" in release revisions()

Add a missing reflog_walk_info_release() to "reflog-walk.c" and use it
in release_revisions().

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/reflog-walk.c b/reflog-walk.c
index 8ac4b28..7aa6595 100644
--- a/reflog-walk.c
+++ b/reflog-walk.c
@@ -8,7 +8,7 @@
 
 struct complete_reflogs {
 	char *ref;
-	const char *short_ref;
+	char *short_ref;
 	struct reflog_info {
 		struct object_id ooid, noid;
 		char *email;
@@ -51,9 +51,16 @@ static void free_complete_reflog(struct complete_reflogs *array)
 	}
 	free(array->items);
 	free(array->ref);
+	free(array->short_ref);
 	free(array);
 }
 
+static void complete_reflogs_clear(void *util, const char *str)
+{
+	struct complete_reflogs *array = util;
+	free_complete_reflog(array);
+}
+
 static struct complete_reflogs *read_complete_reflog(const char *ref)
 {
 	struct complete_reflogs *reflogs =
@@ -116,6 +123,21 @@ void init_reflog_walk(struct reflog_walk_info **info)
 	(*info)->complete_reflogs.strdup_strings = 1;
 }
 
+void reflog_walk_info_release(struct reflog_walk_info *info)
+{
+	size_t i;
+
+	if (!info)
+		return;
+
+	for (i = 0; i < info->nr; i++)
+		free(info->logs[i]);
+	string_list_clear_func(&info->complete_reflogs,
+			       complete_reflogs_clear);
+	free(info->logs);
+	free(info);
+}
+
 int add_reflog_for_walk(struct reflog_walk_info *info,
 		struct commit *commit, const char *name)
 {