src/core/ngx_sha1.c:212: error: Uninitialized Value
  The value read from words[_] was never initialized.

src/core/ngx_sha1.c:212:9: 
210.         STEP(F1, a, b, c, d, e, words[17], 0x5a827999);
211.         STEP(F1, a, b, c, d, e, words[18], 0x5a827999);
212.         STEP(F1, a, b, c, d, e, words[19], 0x5a827999);
             ^
213. 
214.         STEP(F2, a, b, c, d, e, words[20], 0x6ed9eba1);
