src/core/ngx_sha1.c:219: error: Uninitialized Value
  The value read from words[_] was never initialized.

src/core/ngx_sha1.c:219:9: 
217.         STEP(F2, a, b, c, d, e, words[23], 0x6ed9eba1);
218.         STEP(F2, a, b, c, d, e, words[24], 0x6ed9eba1);
219.         STEP(F2, a, b, c, d, e, words[25], 0x6ed9eba1);
             ^
220.         STEP(F2, a, b, c, d, e, words[26], 0x6ed9eba1);
221.         STEP(F2, a, b, c, d, e, words[27], 0x6ed9eba1);
