scsi: qla2xxx: Prevent memory leak for CT req/rsp allocation

This patch fixes memory leak by releasing DMA memory in case CT request and
response allocation fails.

Signed-off-by: Quinn Tran <qtran@marvall.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>