Problem: out-of-date TODO in zmq_poll

Solution: remove it

src/zmq.cpp

@@ -798,8 +798,6 @@ inline int zmq_poller_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
 
 int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
 {
-//  TODO: the function implementation can just call zmq_pollfd_poll with
-//  pollfd as NULL, however pollfd is not yet stable.
 #if defined ZMQ_HAVE_POLLER
     // if poller is present, use that if there is at least 1 thread-safe socket,
     // otherwise fall back to the previous implementation as it's faster.