remove duplicate clip to 8bit function

Originally committed as revision 4143 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/common.h

@@ -501,8 +501,6 @@ tend= rdtsc();\
 #define STOP_TIMER(id) {}
 #endif
 
-#define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
-
 /* avoid usage of various functions */
 #define malloc please_use_av_malloc
 #define free please_use_av_free

libavcodec/mpegvideo.c

@@ -5367,7 +5367,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
         for(i=1;i<64;i++){
             int j= s->dsp.idct_permutation[i];
 
-            s->intra_matrix[j] = CLAMP_TO_8BIT((ff_mpeg1_default_intra_matrix[i] * s->qscale) >> 3);
+            s->intra_matrix[j] = clip_uint8((ff_mpeg1_default_intra_matrix[i] * s->qscale) >> 3);
         }
         convert_matrix(&s->dsp, s->q_intra_matrix, s->q_intra_matrix16, 
                        s->intra_matrix, s->intra_quant_bias, 8, 8, 1);