transport: remove unused "push" in vtable

After commit 0d0bac6 ("transport: drop support for git-over-rsync",
2016-02-01), no transport in Git populates the "push" entry in the
transport vtable. Remove this entry.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: jonathantanmy

transport.c

@@ -627,7 +627,6 @@ void transport_take_over(struct transport *transport,
 	transport->set_option = NULL;
 	transport->get_refs_list = get_refs_via_connect;
 	transport->fetch = fetch_refs_via_pack;
-	transport->push = NULL;
 	transport->push_refs = git_transport_push;
 	transport->disconnect = disconnect_git;
 	transport->smart_options = &(data->options);
@@ -969,13 +968,7 @@ int transport_push(struct transport *transport,
 	*reject_reasons = 0;
 	transport_verify_remote_names(refspec_nr, refspec);
 
-	if (transport->push) {
-		/* Maybe FIXME. But no important transport uses this case. */
-		if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
-			die("This transport does not support using --set-upstream");
-
-		return transport->push(transport, refspec_nr, refspec, flags);
-	} else if (transport->push_refs) {
+	if (transport->push_refs) {
 		struct ref *remote_refs;
 		struct ref *local_refs = get_local_heads();
 		int match_flags = MATCH_REFS_NONE;

transport.h

@@ -103,7 +103,6 @@ struct transport {
 	 * process involved generating new commits.
 	 **/
 	int (*push_refs)(struct transport *transport, struct ref *refs, int flags);
-	int (*push)(struct transport *connection, int refspec_nr, const char **refspec, int flags);
 	int (*connect)(struct transport *connection, const char *name,
 		       const char *executable, int fd[2]);