libavcodec/cavsdec.c:351: error: Uninitialized Value
  The value read from sub_type[_] was never initialized.

libavcodec/cavsdec.c:351:13: 
349.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);
350.                 break;
351.             case B_SUB_FWD:
                 ^
352.                 ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3,
353.                         MV_PRED_MEDIAN, BLK_8X8, 1);
