device/pci: Replace use of dev_find_slot() for IRQs

Change-Id: I48c0de73338430282ce1a4442bbeb7c867dc174c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34079
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/mainboard/emulation/qemu-q35/mainboard.c b/src/mainboard/emulation/qemu-q35/mainboard.c
index 90a32f4..ae3f96a 100644
--- a/src/mainboard/emulation/qemu-q35/mainboard.c
+++ b/src/mainboard/emulation/qemu-q35/mainboard.c
@@ -61,10 +61,10 @@
 
 	/* setup IRQ routing for pci slots */
 	for (i = 0; i < 25; i++)
-		pci_assign_irqs(0, i, qemu_q35_irqs + (i % 4));
+		pci_assign_irqs(pcidev_on_root(i, 0), qemu_q35_irqs + (i % 4));
 	/* setup IRQ routing southbridge devices */
 	for (i = 25; i < 32; i++)
-		pci_assign_irqs(0, i, qemu_q35_irqs);
+		pci_assign_irqs(pcidev_on_root(i, 0), qemu_q35_irqs);
 }
 
 static void qemu_nb_read_resources(struct device *dev)