lib: add one check in "list_sort()"

Add one check in `list_sort()`:
Immediatly return if no any items in this list.

Signed-off-by: anlan_cs <vic.lan@pica8.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/linklist.c b/lib/linklist.c
index 8137b68d8..851948288 100644
--- a/lib/linklist.c
+++ b/lib/linklist.c
@@ -370,10 +370,15 @@ void list_sort(struct list *list, int (*cmp)(const void **, const void **))
 	int i = -1;
 	void *data;
 	size_t n = list->count;
-	void **items = XCALLOC(MTYPE_TMP, (sizeof(void *)) * n);
+	void **items;
 	int (*realcmp)(const void *, const void *) =
 		(int (*)(const void *, const void *))cmp;
 
+	if (!n)
+		return;
+
+	items = XCALLOC(MTYPE_TMP, (sizeof(void *)) * n);
+
 	for (ALL_LIST_ELEMENTS(list, ln, nn, data)) {
 		items[++i] = data;
 		list_delete_node(list, ln);