scsi: bnx2fc: Do not allow both a cleanup completion and abort completion for the same request

If firmware sends either cleanup or abort completion, it means other won't
be sent. Clean out flags for other as well.

Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>