libavcodec/wmaprodec.c:819: error: Uninitialized Value
  The value read from vals[_] was never initialized.

libavcodec/wmaprodec.c:819:17: 
817.         /** decode sign */
818.         for (i = 0; i < 4; i++) {
819.             if (vals[i]) {
                     ^
820.                 int sign = get_bits1(&s->gb) - 1;
821.                 ci->coeffs[cur_coeff] = (vals[i] ^ sign) - sign;
