fsck_head_link(): remove unneeded flag variable

It is never read, so we can pass NULL to resolve_ref_unsafe().
Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: NDavid Turner <dturner@twopensource.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin/fsck.c

@@ -493,13 +493,12 @@ static void fsck_object_dir(const char *path)
 
 static int fsck_head_link(void)
 {
-	int flag;
 	int null_is_error = 0;
 
 	if (verbose)
 		fprintf(stderr, "Checking HEAD link\n");
 
-	head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, &flag);
+	head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 	if (!head_points_at) {
 		errors_found |= ERROR_REFS;
 		return error("Invalid HEAD");