scsi: megaraid_sas: Return immediately from wait_for_adapter_operational after kill adapter

While driver is waiting for adapter to become operational, if a kill
adapter is issued, driver can bail out from the wait loop immediately
rather than waiting for the entire 180 seconds.

Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>