libavutil/sha.c:223: error: Uninitialized Value
  The value read from block[_] was never initialized.

libavutil/sha.c:223:9: 
221. 
222.     for (; i < 64;) {
223.         ROUND256_16_TO_63(a, b, c, d, e, f, g, h);
             ^
224.         ROUND256_16_TO_63(h, a, b, c, d, e, f, g);
225.         ROUND256_16_TO_63(g, h, a, b, c, d, e, f);
