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>
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