[WIP/PATCH v4 5/8] for-each-ref: introduce 'ref_filter_clear_data()'

[Karthik Nayak <karthik.188@gmail.com>]

Introduce and implement 'ref_filter_clear_data()' which will free
all allocated memory for 'ref_filter_cbdata' and its underlying array
of 'ref_array_item'.

Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
---
 builtin/for-each-ref.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index ef54c90..f896e1c 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -907,6 +907,18 @@ static int grab_single_ref(const char *refname, const unsigned char *sha1, int f
 	return 0;
 }
 
+/* Free all memory allocated for ref_filter_cbdata */
+void ref_filter_clear_data(struct ref_filter_cbdata *ref_cbdata)
+{
+	int i;
+
+	for (i = 0; i < ref_cbdata->array.nr; i++)
+		free(ref_cbdata->array.items[i]);
+	free(ref_cbdata->array.items);
+	ref_cbdata->array.items = NULL;
+	ref_cbdata->array.nr = ref_cbdata->array.alloc = 0;
+}
+
 static int cmp_ref_sort(struct ref_sort *s, struct ref_array_item *a, struct ref_array_item *b)
 {
 	struct atom_value *va, *vb;
@@ -1137,5 +1149,6 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 		maxcount = ref_cbdata.array.nr;
 	for (i = 0; i < maxcount; i++)
 		show_ref(ref_cbdata.array.items[i], format, quote_style);
+	ref_filter_clear_data(&ref_cbdata);
 	return 0;
 }
-- 
2.4.2