UBUNTU: SAUCE: (noup) qla2xxx: Add irq affinity notification V2

BugLink: http://bugs.launchpad.net/bugs/1554003

Commit cdb898c5 introduced a regression by accessing a Null pointer.  This occured
 when checking older 4G adapters, that do not have MSIX support.  Add a check for rsp->msix.

Fixes: commit cdb898c5: ("qla2xxx: Add irq affinity notification")
Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/scsi/qla2xxx/qla_isr.c

@@ -2552,7 +2552,7 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha,
 	if (!vha->flags.online)
 		return;
 
-	if (rsp->msix->cpuid != smp_processor_id()) {
+	if (rsp->msix && (rsp->msix->cpuid != smp_processor_id())) {
 		/* if kernel does not notify qla of IRQ's CPU change,
 		 * then set it here.
 		 */