vga16fb: Remove unused variable

Fix build warning of unused variable:

drivers/video/vga16fb.c:1268:26: warning: unused variable ‘dev’ [-Wunused-variable]

Signed-off-by: Luis Henriques<luis.henriques@canonical.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/vga16fb.c

@@ -1265,7 +1265,6 @@ static void vga16fb_imageblit(struct fb_info *info, const struct fb_image *image
 
 static void vga16fb_destroy(struct fb_info *info)
 {
-	struct platform_device *dev = container_of(info->device, struct platform_device, dev);
 	iounmap(info->screen_base);
 	fb_dealloc_cmap(&info->cmap);
 	/* XXX unshare VGA regions */