simplify

Originally committed as revision 7995 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -1039,7 +1039,7 @@ static inline int check_intra_pred_mode(H264Context *h, int mode){
     static const int8_t top [7]= {LEFT_DC_PRED8x8, 1,-1,-1};
     static const int8_t left[7]= { TOP_DC_PRED8x8,-1, 2,-1,DC_128_PRED8x8};
 
-    if(mode < 0 || mode > 6) {
+    if(mode > 6U) {
         av_log(h->s.avctx, AV_LOG_ERROR, "out of range intra chroma pred mode at %d %d\n", s->mb_x, s->mb_y);
         return -1;
     }