powerpc/pseries: Correct MSI allocation tracking

The per-device MSI allocation calculation in pseries_irq_domain_alloc()
is clearly wrong. It can still happen to work when nr_irqs is 1.

Correct it.

Fixes: c0215e2 ("powerpc/pseries: Fix MSI-X allocation failure when quota is exceeded")
Cc: [email protected]
Signed-off-by: Nam Cao <[email protected]>
Reviewed-by: Mahesh Salgaonkar <[email protected]>
Reviewed-by: Nilay Shroff <[email protected]>
[maddy: Fixed Nilay's reviewed-by tag]
Signed-off-by: Madhavan Srinivasan <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: covanam

arch/powerpc/platforms/pseries/msi.c

@@ -605,7 +605,7 @@ static int pseries_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
 					      &pseries_msi_irq_chip, pseries_dev);
 	}
 
-	pseries_dev->msi_used++;
+	pseries_dev->msi_used += nr_irqs;
 	return 0;
 
 out: