Remove unreachable codes for vhci

Old vhci gave unnecessary null check for descriptors in pluginfo which
are statically allocated. Those unreachable codes are removed.

See #251 (comment)

Author: cezanne

driver/vhci/vhci_plugin.c

@@ -50,36 +50,19 @@ vhci_init_vpdo(pvpdo_dev_t vpdo)
 static void
 setup_vpdo_with_dsc_dev(pvpdo_dev_t vpdo, PUSB_DEVICE_DESCRIPTOR dsc_dev)
 {
-	if (dsc_dev) {
-		vpdo->vendor = dsc_dev->idVendor;
-		vpdo->product = dsc_dev->idProduct;
-		vpdo->revision = dsc_dev->bcdDevice;
-		vpdo->usbclass = dsc_dev->bDeviceClass;
-		vpdo->subclass = dsc_dev->bDeviceSubClass;
-		vpdo->protocol = dsc_dev->bDeviceProtocol;
-		vpdo->speed = (UCHAR)get_usb_speed(dsc_dev->bcdUSB);
-		vpdo->num_configurations = dsc_dev->bNumConfigurations;
-	} else {
-		/* TODO: can happen? */
-		vpdo->vendor = 0;
-		vpdo->product = 0;
-		vpdo->revision = 0;
-		vpdo->usbclass = 0;
-		vpdo->subclass = 0;
-		vpdo->protocol = 0;
-		vpdo->speed = USB_SPEED_LOW;
-		vpdo->num_configurations = 1;
-	}
+	vpdo->vendor = dsc_dev->idVendor;
+	vpdo->product = dsc_dev->idProduct;
+	vpdo->revision = dsc_dev->bcdDevice;
+	vpdo->usbclass = dsc_dev->bDeviceClass;
+	vpdo->subclass = dsc_dev->bDeviceSubClass;
+	vpdo->protocol = dsc_dev->bDeviceProtocol;
+	vpdo->speed = (UCHAR)get_usb_speed(dsc_dev->bcdUSB);
+	vpdo->num_configurations = dsc_dev->bNumConfigurations;
 }
 
 static void
 setup_vpdo_with_dsc_conf(pvpdo_dev_t vpdo, PUSB_CONFIGURATION_DESCRIPTOR dsc_conf)
 {
-	if (!dsc_conf) {
-		vpdo->inum = 0;
-		return;
-	}
-
 	vpdo->inum = dsc_conf->bNumInterfaces;
 
 	/* Many devices have 0 usb class number in a device descriptor.