ARM: sa1111: Fix irq_retrigger callback return value

The irq_retrigger callback is supposed to return 0 when retrigger
has failed, and a non-zero value otherwise. Tell the core code
that the driver has succedded in using the HW to retrigger the
interrupt (if ever).
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200310184921.23552-4-maz@kernel.org

arch/arm/common/sa1111.c

@@ -302,10 +302,13 @@ static int sa1111_retrigger_irq(struct irq_data *d)
 			break;
 	}
 
-	if (i == 8)
+	if (i == 8) {
 		pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n",
 		       d->irq);
-	return i == 8 ? -1 : 0;
+		return 0;
+	}
+
+	return 1;
 }
 
 static int sa1111_type_irq(struct irq_data *d, unsigned int flags)