RDMA/bnxt_re: Fix an error path in bnxt_re_add_device

RDMA/bnxt_re: Fix an error path in bnxt_re_add_device

In bnxt_re_add_device(), when register netdev notifier fails, driver is
not unregistering the IB device in the error cleanup path.  Also, removed
the duplicate cleanup in error path of bnxt_re_probe.

Fixes: 94a9dc6ac8f7 ("RDMA/bnxt_re: Group all operations under add_device and remove_device")
Link: https://patch.msgid.link/r/1728373302-19530-8-git-send-email-selvin.xavier@broadcom.com
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>