src/http/ngx_http_file_cache.c:472: error: Integer Overflow L1
  (0 - 1):unsigned32.

src/http/ngx_http_file_cache.c:471:5: <LHS trace>
469. wakeup:
470. 
471.     c->waiting = 0;
         ^
472.     r->main->blocked--;
473.     r->connection->write->handler(r->connection->write);

src/http/ngx_http_file_cache.c:471:5: Assignment
469. wakeup:
470. 
471.     c->waiting = 0;
         ^
472.     r->main->blocked--;
473.     r->connection->write->handler(r->connection->write);

src/http/ngx_http_file_cache.c:472:5: Binary operation: (0 - 1):unsigned32
470. 
471.     c->waiting = 0;
472.     r->main->blocked--;
         ^
473.     r->connection->write->handler(r->connection->write);
474. }
