use alloc_ref rather than hand-allocating "struct ref"

This saves us some manual computation, and eliminates a call
to strcpy.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fetch.c

@@ -639,8 +639,7 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 				continue;
 
 			if (rm->peer_ref) {
-				ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
-				strcpy(ref->name, rm->peer_ref->name);
+				ref = alloc_ref(rm->peer_ref->name);
 				hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 				hashcpy(ref->new_sha1, rm->old_sha1);
 				ref->force = rm->peer_ref->force;

remote-curl.c

@@ -168,10 +168,7 @@ static struct ref *parse_info_refs(struct discovery *heads)
 				    url.buf);
 			data[i] = 0;
 			ref_name = mid + 1;
-			ref = xmalloc(sizeof(struct ref) +
-				      strlen(ref_name) + 1);
-			memset(ref, 0, sizeof(struct ref));
-			strcpy(ref->name, ref_name);
+			ref = alloc_ref(ref_name);
 			get_sha1_hex(start, ref->old_sha1);
 			if (!refs)
 				refs = ref;