usb: gadget serial: don't shift bcd version left by 16

Fengguang Wu reported:
|drivers/usb/gadget/serial.c:89:22: sparse: cast truncates bits from
|constant value (24000000 becomes 0)

I obviously let the version number shift away. Since the version is a
16bit number it can be applied as it.

Cc: fengguang.wu@intel.com
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/serial.c

@@ -86,7 +86,7 @@ static struct usb_device_descriptor device_desc = {
 	/* .bMaxPacketSize0 = f(hardware) */
 	.idVendor =		cpu_to_le16(GS_VENDOR_ID),
 	/* .idProduct =	f(use_acm) */
-	.bcdDevice = cpu_to_le16(GS_VERSION_NUM << 16),
+	.bcdDevice = cpu_to_le16(GS_VERSION_NUM),
 	/* .iManufacturer = DYNAMIC */
 	/* .iProduct = DYNAMIC */
 	.bNumConfigurations =	1,