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/db.c b/lib/libalpm/db.c
index b94d3342..bb4c4bd9 100644
--- a/lib/libalpm/db.c
+++ b/lib/libalpm/db.c
@@ -344,6 +344,7 @@ alpm_db_t *_alpm_db_new(const char *treename, int is_local)
 
 void _alpm_db_free(alpm_db_t *db)
 {
+	ASSERT(db != NULL, return);
 	/* cleanup pkgcache */
 	_alpm_db_free_pkgcache(db);
 	/* cleanup server list */