src/core/ngx_sha1.c:187: error: Uninitialized Value
  The value read from words[_] was never initialized.

src/core/ngx_sha1.c:187:13: 
185. 
186.         for (i = 16; i < 80; i++) {
187.             words[i] = ROTATE(1, words[i - 3] ^ words[i - 8] ^ words[i - 14]
                 ^
188.                                  ^ words[i - 16]);
189.         }
