zmq::devpoll_t : correct a typo in loop()

A minor typo correction to resolve compilation error on Solaris.
Signed-off-by: Martin Pales <m.pales@gmail.com>

AUTHORS

@@ -26,6 +26,7 @@ Jon Dyte <jon@totient.co.uk>
 Kamil Shakirov <kamils80@gmail.com>
 Martin Hurton <hurtonm@gmail.com>
 Martin Lucina <mato@kotelna.sk>
+Martin Pales <m.pales@gmail.com>
 Martin Sustrik <sustrik@250bpm.com>
 Matus Hamorsky <mhamorsky@gmail.com>
 Max Wolf <YIDIEPXGXGPN@spammotel.com>

src/devpoll.cpp

@@ -155,7 +155,7 @@ void zmq::devpoll_t::loop ()
         //  Wait for events.
         poll_req.dp_fds = &ev_buf [0];
         poll_req.dp_nfds = nfds;
-        poll_req.dp_timeout = timout ? timeout : -1;
+        poll_req.dp_timeout = timeout ? timeout : -1;
         int n = ioctl (devpoll_fd, DP_POLL, &poll_req);
         if (n == -1 && errno == EINTR)
             continue;