src/http/ngx_http_upstream_round_robin.c:537: error: Uninitialized Value
  The value read from m was never initialized.

src/http/ngx_http_upstream_round_robin.c:537:9: 
535.         }
536. 
537.         rrp->tried[n] |= m;
             ^
538.     }
539. 
