RDMA/ionic: Fix potential NULL pointer dereference in ionic_query_port

RDMA/ionic: Fix potential NULL pointer dereference in ionic_query_port

The function ionic_query_port() calls ib_device_get_netdev() without
checking the return value which could lead to NULL pointer dereference,
Fix it by checking the return value and return -ENODEV if the 'ndev' is
NULL.

Fixes: 2075bbe8ef03 ("RDMA/ionic: Register device ops for miscellaneous functionality")
Signed-off-by: Kamal Heib <kheib@redhat.com>
Link: https://patch.msgid.link/20260220222125.16973-2-kheib@redhat.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>