list-objects: check if filter is NULL before using

diff --git a/pack-check.c b/pack-check.c
index e1fcb228fa126e34528e9d5a38b81a6b2eae2f2a..073c1fbd46dfeeb215c209aa0659768e72b81c3b 100644 (file)
--- a/pack-check.c
+++ b/pack-check.c
@@ -2,6 +2,7 @@
 #include "pack.h"
 #include "pack-revindex.h"
 #include "progress.h"
+#include "packfile.h"
 
 struct idx_entry {
        off_t                offset;