get_expanded_map(): avoid memory leak

The old code could leak *expn_name if match_name_with_pattern()
succeeded but ignore_symref_update() returned true.  So make sure that
*expn_name is freed in any case.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

remote.c

@@ -1567,9 +1567,9 @@ static struct ref *get_expanded_map(const struct ref *remote_refs,
 	struct ref *ret = NULL;
 	struct ref **tail = &ret;
 
-	char *expn_name;
-
 	for (ref = remote_refs; ref; ref = ref->next) {
+		char *expn_name = NULL;
+
 		if (strchr(ref->name, '^'))
 			continue; /* a dereference item */
 		if (match_name_with_pattern(refspec->src, ref->name,
@@ -1578,12 +1578,12 @@ static struct ref *get_expanded_map(const struct ref *remote_refs,
 			struct ref *cpy = copy_ref(ref);
 
 			cpy->peer_ref = alloc_ref(expn_name);
-			free(expn_name);
 			if (refspec->force)
 				cpy->peer_ref->force = 1;
 			*tail = cpy;
 			tail = &cpy->next;
 		}
+		free(expn_name);
 	}
 
 	return ret;