net: ena: add missing return when ena_com_get_io_handlers() fails

net: ena: add missing return when ena_com_get_io_handlers() fails

BugLink: http://bugs.launchpad.net/bugs/1701575
Fixes: 1738cd3ed342 ("Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Netanel Belgazal <netanel@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 2d2c600a917127f16f179d5a88fc44ba3ed263ed)
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>