libavcodec/clearvideo.c:236: error: Uninitialized Value
  The value read from has_ac[_] was never initialized.

libavcodec/clearvideo.c:236:13: 
234.     off = x * 16 + y * 16 * c->pic->linesize[0];
235.     for (i = 0; i < 4; i++) {
236.         if (decode_block(c, c->block, has_ac[i], c->ac_quant) < 0)
                 ^
237.             return AVERROR_INVALIDDATA;
238.         if (!x && !(i & 1)) {
