builtin/repack: fix leaking keep-pack list

The list of packs to keep is populated via a command line option but
never free'd. Plug this memory leak.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/repack.c

@@ -1525,6 +1525,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	}
 
 cleanup:
+	string_list_clear(&keep_pack_list, 0);
 	string_list_clear(&names, 1);
 	existing_packs_release(&existing);
 	free_pack_geometry(&geometry);

t/t6500-gc.sh

@@ -3,6 +3,7 @@
 test_description='basic git gc tests
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 

t/t7703-repack-geometric.sh

@@ -2,6 +2,7 @@
 
 test_description='git repack --geometric works correctly'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 GIT_TEST_MULTI_PACK_INDEX=0