Remove a redundant assignment, found by clang

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22790 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/rtsp.c

@@ -1897,8 +1897,6 @@ static int rtsp_read_pause(AVFormatContext *s)
     RTSPState *rt = s->priv_data;
     RTSPMessageHeader reply1, *reply = &reply1;
 
-    rt = s->priv_data;
-
     if (rt->state != RTSP_STATE_STREAMING)
         return 0;
     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {