avformat/rtsp: free opts dictionary on failure of getnameinfo

Fixes: CID 1341579.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

libavformat/rtsp.c

@@ -2300,6 +2300,7 @@ static int sdp_read_header(AVFormatContext *s)
             if (err) {
                 av_log(s, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(err));
                 err = AVERROR(EIO);
+                av_dict_free(&opts);
                 goto fail;
             }
             ff_url_join(url, sizeof(url), "rtp", NULL,