Fix sb16 breakage due to unassigned s->irq

Signed-off-by: Nmalc <av1474@comtv.ru>

hw/sb16.c

@@ -1409,6 +1409,7 @@ int SB16_init (qemu_irq *pic)
 
     s->cmd = -1;
     s->pic = isa_reserve_irq (conf.irq);
+    s->irq = conf.irq;
     s->dma = conf.dma;
     s->hdma = conf.hdma;
     s->port = conf.port;