vt6656: Use request_firmware() to load firmware

The file added to linux-firmware is a copy of the current array which
does not have a recognisable header, so no validation is done.

Change the firmware version check to accept newer versions.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/vt6656/Kconfig

@@ -3,6 +3,7 @@ config VT6656
 	depends on USB && WLAN
 	select WIRELESS_EXT
 	select WEXT_PRIV
+	select FW_LOADER
 	---help---
 	This is a vendor-written driver for VIA VT6656.
 

drivers/staging/vt6656/device.h

@@ -55,6 +55,7 @@
 #include <linux/reboot.h>
 #include <linux/usb.h>
 #include <linux/signal.h>
+#include <linux/firmware.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #ifdef SIOCETHTOOL
@@ -421,6 +422,8 @@ typedef struct __device_info {
     struct net_device*          dev;
     struct net_device_stats     stats;
 
+    const struct firmware	*firmware;
+
     OPTIONS                     sOpts;
 
 	struct tasklet_struct       CmdWorkItem;

drivers/staging/vt6656/main_usb.c

@@ -1272,6 +1272,9 @@ static void __devexit vt6656_disconnect(struct usb_interface *intf)
 
 	device_release_WPADEV(device);
 
+	if (device->firmware)
+		release_firmware(device->firmware);
+
 	usb_set_intfdata(intf, NULL);
 	usb_put_dev(interface_to_usbdev(intf));