git-fetch-pack: really do not ask for funny refs

If git-fetch-pack was called with out any refspec, it would ask the server
for funny refs. That cannot work, since the funny refs are not marked
as OUR_REF by upload-pack, which just exits with an error.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

fetch-pack.c

@@ -262,9 +262,6 @@ static void filter_refs(struct ref **refs, int nr_match, char **match)
 {
 	struct ref *prev, *current, *next;
 
-	if (!nr_match)
-		return;
-
 	for (prev = NULL, current = *refs; current; current = next) {
 		next = current->next;
 		if ((!memcmp(current->name, "refs/", 5) &&