wpa_gui: Remove unneeded wpa_ctrl_request() msg_cb

wpa_supplicant/wpa_gui-qt4/wpagui.cpp

@@ -443,22 +443,13 @@ int WpaGui::openCtrlConnection(const char *ifname)
 }
 
 
-static void wpa_gui_msg_cb(char *msg, size_t)
-{
-	/* This should not happen anymore since two control connections are
-	 * used. */
-	printf("missed message: %s\n", msg);
-}
-
-
 int WpaGui::ctrlRequest(const char *cmd, char *buf, size_t *buflen)
 {
 	int ret;
 
 	if (ctrl_conn == NULL)
 		return -3;
-	ret = wpa_ctrl_request(ctrl_conn, cmd, strlen(cmd), buf, buflen,
-			       wpa_gui_msg_cb);
+	ret = wpa_ctrl_request(ctrl_conn, cmd, strlen(cmd), buf, buflen, NULL);
 	if (ret == -2)
 		printf("'%s' command timed out.\n", cmd);
 	else if (ret < 0)