RTSP: GET_PARAMETER requests have a body

Bug: http://curl.haxx.se/bug/view.cgi?id=3383692

lib/rtsp.c

@@ -294,6 +294,7 @@ static CURLcode rtsp_do(struct connectdata *conn, bool *done)
   case RTSPREQ_GET_PARAMETER:
     /* GET_PARAMETER's no_body status is determined later */
     p_request = "GET_PARAMETER";
+    data->set.opt_no_body = FALSE;
     break;
   case RTSPREQ_SET_PARAMETER:
     p_request = "SET_PARAMETER";