h264: fix size of arrays in ff_h264_check_intra_pred_mode()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264.c

@@ -478,8 +478,8 @@ int ff_h264_check_intra4x4_pred_mode(H264Context *h)
  */
 int ff_h264_check_intra_pred_mode(H264Context *h, int mode, int is_chroma)
 {
-    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 };
+    static const int8_t top[4]  = { LEFT_DC_PRED8x8, 1, -1, -1 };
+    static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
 
     if (mode > 3U) {
         av_log(h->avctx, AV_LOG_ERROR,