RDMA/bnxt_re: Properly order ib_device_unalloc() to avoid UAF

ib_dealloc_device() should be called only after device cleanup.  Fix the
dealloc sequence.

Fixes: 6d758147 ("RDMA/bnxt_re: Use auxiliary driver interface")
Link: https://lore.kernel.org/r/1691642677-21369-2-git-send-email-selvin.xavier@broadcom.com


Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>