rtmp: Drop an unneeded warning

Apparently a widely used streaming server requires that the second
field always presents a version during C1 phase.

libavformat/rtmpproto.c

@@ -1398,8 +1398,6 @@ static int rtmp_server_handshake(URLContext *s, RTMPContext *rt)
         av_log(s, AV_LOG_ERROR, "RTMP Handshake C1 Error\n");
         return ret;
     }
-    if (zeroes)
-        av_log(s, AV_LOG_WARNING, "Erroneous C1 Message zero != 0\n");
     /* Send S1 */
     /* By now same epoch will be sent */
     hs_my_epoch = hs_epoch;