fix rtp 916 issue, patch 2

Reviewed-by: Luca Abeni <lucabe72@email.it>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/rtsp.c

@@ -1161,17 +1161,15 @@ int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
             }
 
             /* first try in specified port range */
-            if (RTSP_RTP_PORT_MIN != 0) {
             while (j <= RTSP_RTP_PORT_MAX) {
                 ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
                             "?localport=%d", j);
                 /* we will use two ports per rtp stream (rtp and rtcp) */
                 j += 2;
-                    if (ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
-                                   &s->interrupt_callback, NULL) == 0)
+                if (!ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
+                               &s->interrupt_callback, NULL))
                     goto rtp_opened;
             }
-            }
             av_log(s, AV_LOG_ERROR, "Unable to open an input RTP port\n");
             err = AVERROR(EIO);
             goto fail;