Remove several useless writes to variables, found by CSA.

Originally committed as revision 18579 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263.c

@@ -401,7 +401,6 @@ static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int bloc
                 else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
             }else
                 rate += s->ac_esc_length;
-            level-= 64;
 
             last= j;
         }
@@ -1552,7 +1551,7 @@ void ff_h263_loop_filter(MpegEncContext * s){
 #if CONFIG_ENCODERS
 static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
 {
-    int x, y, wrap, a, c, pred_dc, scale;
+    int x, y, wrap, a, c, pred_dc;
     int16_t *dc_val;
 
     /* find prediction */
@@ -1561,13 +1560,11 @@ static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
         y = 2 * s->mb_y + ((n & 2) >> 1);
         wrap = s->b8_stride;
         dc_val = s->dc_val[0];
-        scale = s->y_dc_scale;
     } else {
         x = s->mb_x;
         y = s->mb_y;
         wrap = s->mb_stride;
         dc_val = s->dc_val[n - 4 + 1];
-        scale = s->c_dc_scale;
     }
     /* B C
      * A X
@@ -1589,7 +1586,6 @@ static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
         pred_dc = c;
 
     /* we assume pred is positive */
-    //pred_dc = (pred_dc + (scale >> 1)) / scale;
     *dc_val_ptr = &dc_val[x + y * wrap];
     return pred_dc;
 }