Add missing endianness conversion when using the USB device-descriptor
bcdDevice field to construct a firmware file name.
Fixes: 8ef80aef118e ("[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>