http: don't discard the HEAD ref

The fix for fetching from empty repositories (22935b06 protocol:
don't store flushes; 2012-10-07) forgot to take into account the
deletion of the flush pkt in the HTTP transport. As a result, the HEAD
ref advertisement where we detect the remote's capabilities was
deleted instead. Fix this.

src/transports/http.c

@@ -473,10 +473,7 @@ static int http_connect(git_transport *transport, int direction)
 		giterr_set(GITERR_NET, "Invalid HTTP response");
 		return t->error = -1;
 	} else {
-		/* Remove the comment and flush pkts */
-		git_vector_remove(&transport->refs, 0);
-		git__free(pkt);
-		pkt = git_vector_get(&transport->refs, 0);
+		/* Remove the comment pkt from the list */
 		git_vector_remove(&transport->refs, 0);
 		git__free(pkt);
 	}