RDMA/bnxt_re: Fix a possible NULL pointer dereference

RDMA/bnxt_re: Fix a possible NULL pointer dereference

There is a possibility of a NULL pointer dereference in the failure path
of bnxt_re_add_device().  To address that, moved the update of
"rdev->adev" to bnxt_re_dev_add().

Fixes: dee3da3422d5 ("RDMA/bnxt_re: Change aux driver data to en_info to hold more information")
Link: https://patch.msgid.link/r/1728373302-19530-6-git-send-email-selvin.xavier@broadcom.com
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-rdma/CAH-L+nMCwymKGqf5pd8-FZNhxEkDD=kb6AoCaE6fAVi7b3e5Qw@mail.gmail.com/T/#t
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>