remote: convert struct push_cas to struct object_id

This gets rid of one use of get_sha1.
Signed-off-by: Nbrian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

remote.c

@@ -2294,8 +2294,8 @@ static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, i
 	if (!*colon)
 		entry->use_tracking = 1;
 	else if (!colon[1])
-		hashclr(entry->expect);
-	else if (get_sha1(colon + 1, entry->expect))
+		oidclr(&entry->expect);
+	else if (get_oid(colon + 1, &entry->expect))
 		return error("cannot parse expected object name '%s'", colon + 1);
 	return 0;
 }
@@ -2342,7 +2342,7 @@ static void apply_cas(struct push_cas_option *cas,
 			continue;
 		ref->expect_old_sha1 = 1;
 		if (!entry->use_tracking)
-			hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
+			oidcpy(&ref->old_oid_expect, &entry->expect);
 		else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
 			oidclr(&ref->old_oid_expect);
 		return;

remote.h

@@ -282,7 +282,7 @@ struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fet
 struct push_cas_option {
 	unsigned use_tracking_for_rest:1;
 	struct push_cas {
-		unsigned char expect[20];
+		struct object_id expect;
 		unsigned use_tracking:1;
 		char *refname;
 	} *entry;