rfbsrc: Don't ignore errors

This prevents recursion on error. This used to happen as we
don't change the state when something fails. We end up running
and failing in the same state forever.

gst/librfb/gstrfbsrc.c

@@ -557,6 +557,7 @@ gst_rfb_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
             ("Error on setup VNC connection to host %s on port %d", src->host,
                 src->port), (NULL));
       }
+      return GST_FLOW_ERROR;
     }
   }