Remove unused variable mb_xy.

Patch by avcoder, ffmpeg gmail 


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@21945 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/h264.c

@@ -981,7 +981,6 @@ static inline void xchg_mb_border(H264Context *h, uint8_t *src_y, uint8_t *src_c
     MpegEncContext * const s = &h->s;
     int deblock_left;
     int deblock_top;
-    int mb_xy;
     int top_idx = 1;
     uint8_t *top_border_m1;
     uint8_t *top_border;