Get rid of useless casts.

Originally committed as revision 20831 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rmdec.c

@@ -327,13 +327,13 @@ ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
 //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
         st->codec->time_base.den = fps * st->codec->time_base.num;
         //XXX: do we really need that?
-        switch(((uint8_t*)st->codec->extradata)[4]>>4){
+        switch(st->codec->extradata[4]>>4){
         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
         default:
-            av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", ((uint8_t*)st->codec->extradata)[0], ((uint8_t*)st->codec->extradata)[1], ((uint8_t*)st->codec->extradata)[2], ((uint8_t*)st->codec->extradata)[3], ((uint8_t*)st->codec->extradata)[4]);
+            av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", st->codec->extradata[0], st->codec->extradata[1], st->codec->extradata[2], st->codec->extradata[3], st->codec->extradata[4]);
             goto fail1;
         }
     }