scsi: bnx2fc: Fix error handling in probe()

There are two issues here.  First if cmgr->hba is not set early enough then
it leads to a NULL dereference.  Second if we don't completely initialize
cmgr->io_bdt_pool[] then we end up dereferencing uninitialized pointers.

Fixes: 853e2bd2 ("[SCSI] bnx2fc: Broadcom FCoE offload driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>