net: wwan: core: Return poll error in case of port removal

Ensure that the poll system call returns proper error flags when port
is removed (nullified port ops), allowing user side to properly fail,
without further read or write.

Fixes: 9a44c1cc ("net: Add a WWAN subsystem")
Signed-off-by: NLoic Poulain <loic.poulain@linaro.org>
Reviewed-by: NLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/wwan/wwan_core.c

@@ -508,6 +508,8 @@ static __poll_t wwan_port_fops_poll(struct file *filp, poll_table *wait)
 		mask |= EPOLLOUT | EPOLLWRNORM;
 	if (!is_read_blocked(port))
 		mask |= EPOLLIN | EPOLLRDNORM;
+	if (!port->ops)
+		mask |= EPOLLHUP | EPOLLERR;
 
 	return mask;
 }