t4002 (diff-basic): use test_might_fail for commands that might fail

diff --git a/builtin/show-ref.c b/builtin/show-ref.c
index 0b2a9ad1a9a8a825c2e2104f8a9f729a9cb03d1a..be9b512eebc72984e6ff4cdd4859ab7951539e19 100644 (file)
--- a/builtin/show-ref.c
+++ b/builtin/show-ref.c
@@ -120,7 +120,7 @@ static int add_existing(const char *refname, const unsigned char *sha1, int flag
  */
 static int exclude_existing(const char *match)
 {
-       static struct string_list existing_refs = { NULL, 0, 0, 0 };
+       static struct string_list existing_refs = STRING_LIST_INIT_NODUP;
        char buf[1024];
        int matchlen = match ? strlen(match) : 0;