RDMA/bnxt_re: Fix the ib_reg failure cleanup

[ Upstream commit 497158aa5f520db50452ef928c0f955cb42f2e77 ]

Release the netdev references in the cleanup path.  Invokes the cleanup
routines if bnxt_re_ib_reg fails.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>