net: netmap_poll must update both read/write poll state

Signed-off-by: Prasad Joshi <prasadjoshi.linux@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

net/netmap.c

@@ -177,8 +177,8 @@ static void netmap_poll(NetClientState *nc, bool enable)
     NetmapState *s = DO_UPCAST(NetmapState, nc, nc);
 
     if (s->read_poll != enable || s->write_poll != enable) {
-        s->read_poll = enable;
-        s->read_poll = enable;
+        s->write_poll = enable;
+        s->read_poll  = enable;
         netmap_update_fd_handler(s);
     }
 }