iommu/vt-d: Fix return value check of parse_ioapics_under_ir()

The function returns 0 on success, so check for the right
value.
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel_irq_remapping.c

@@ -690,7 +690,7 @@ static int __init intel_prepare_irq_remapping(void)
 	if (!dmar_ir_support())
 		return -ENODEV;
 
-	if (!parse_ioapics_under_ir()) {
+	if (parse_ioapics_under_ir()) {
 		pr_info("Not enabling interrupt remapping\n");
 		goto error;
 	}