Remove redundant nnz variable.

Originally committed as revision 16209 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -2531,8 +2531,7 @@ static av_always_inline void hl_decode_mb_internal(H264Context *h, int simple){
                     if(transform_bypass){
                         const int di = IS_8x8DCT(mb_type) ? 4 : 1;
                         for(i=0; i<16; i+=di){
-                            int nnz = h->non_zero_count_cache[ scan8[i] ];
-                            if(nnz){
+                            if(h->non_zero_count_cache[ scan8[i] ]){
                                 idct_add(dest_y + block_offset[i], h->mb + i*16, linesize);
                             }
                         }