Alpm, check for NULL in free-functions

Also, use FREE() instead of free() in _alpm_backup_free()
to set the pointers to NULL.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/libalpm/graph.c b/lib/libalpm/graph.c
index 4d58169c..7c3cce14 100644
--- a/lib/libalpm/graph.c
+++ b/lib/libalpm/graph.c
@@ -31,6 +31,7 @@ alpm_graph_t *_alpm_graph_new(void)
 
 void _alpm_graph_free(void *data)
 {
+	ASSERT(data != NULL, return);
 	alpm_graph_t *graph = data;
 	alpm_list_free(graph->children);
 	free(graph);