avcodec/h264_cabac: Fix use with the checked bitstream-reader

Found-by: Dale Curtis <dalecurtis@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264_cabac.c

@@ -1619,6 +1619,9 @@ decode_cabac_residual_internal(H264Context *h, int16_t *block,
     cc.range     = h->cabac.range;
     cc.low       = h->cabac.low;
     cc.bytestream= h->cabac.bytestream;
+#if !UNCHECKED_BITSTREAM_READER
+    cc.bytestream_end = h->cabac.bytestream_end;
+#endif
 #else
 #define CC &h->cabac
 #endif