isapc: Fix irq routing

Only send irqs to ioapic in case we have one.
Fixes qemu segfault.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/pc.c

@@ -100,6 +100,7 @@ static void isa_irq_handler(void *opaque, int n, int level)
     if (n < 16) {
         qemu_set_irq(isa->i8259[n], level);
     }
+    if (isa->ioapic)
         qemu_set_irq(isa->ioapic[n], level);
 };