usb/uhci: Misc clean up

Fix a comment for coding style so subsequent patch will not get
checkpatch error and simplify and shorten uhci_update_irq().

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <b68a57dfcf181e73272b4dc951f8cc6e76b0d182.1635161629.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

hw/usb/hcd-uhci.c

@@ -290,16 +290,14 @@ static UHCIAsync *uhci_async_find_td(UHCIState *s, uint32_t td_addr)
 
 static void uhci_update_irq(UHCIState *s)
 {
-    int level;
+    int level = 0;
     if (((s->status2 & 1) && (s->intr & (1 << 2))) ||
         ((s->status2 & 2) && (s->intr & (1 << 3))) ||
         ((s->status & UHCI_STS_USBERR) && (s->intr & (1 << 0))) ||
         ((s->status & UHCI_STS_RD) && (s->intr & (1 << 1))) ||
         (s->status & UHCI_STS_HSERR) ||
         (s->status & UHCI_STS_HCPERR)) {
         level = 1;
-    } else {
-        level = 0;
     }
     pci_set_irq(&s->dev, level);
 }
@@ -1170,8 +1168,7 @@ void usb_uhci_common_realize(PCIDevice *dev, Error **errp)
 
     pci_conf[PCI_CLASS_PROG] = 0x00;
     /* TODO: reset value should be 0. */
-    pci_conf[USB_SBRN] = USB_RELEASE_1; // release number
-
+    pci_conf[USB_SBRN] = USB_RELEASE_1; /* release number */
     pci_config_set_interrupt_pin(pci_conf, u->info.irq_pin + 1);
 
     if (s->masterbus) {