net: irda: irda-usb: fix firmware name on big-endian hosts

commit 75cf0679 upstream.

Add missing endianness conversion when using the USB device-descriptor
bcdDevice field to construct a firmware file name.

Fixes: 8ef80aef ("[IRDA]: irda-usb.c: STIR421x cleanups")
Cc: Nick Fedchik <nfedchik@atlantic-link.com.ua>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/net/irda/irda-usb.c

@@ -1083,7 +1083,7 @@ static int stir421x_patch_device(struct irda_usb_cb *self)
          * are "42101001.sb" or "42101002.sb"
          */
         sprintf(stir421x_fw_name, "4210%4X.sb",
-                self->usbdev->descriptor.bcdDevice);
+		le16_to_cpu(self->usbdev->descriptor.bcdDevice));
         ret = request_firmware(&fw, stir421x_fw_name, &self->usbdev->dev);
         if (ret < 0)
                 return ret;