[media] media/vivid-osd: fix info leak in ioctl

The vivid_fb_ioctl() code fails to initialize the 16 _reserved bytes of
struct fb_vblank after the ->hcount member. Add an explicit
memset(0) before filling the structure to avoid the info leak.

Signed-off-by: Salva Peiró <speirofr@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
static int vivid_fb_blank(int blank_mode, struct fb_info *info)
{
	struct vivid_dev *dev = (struct vivid_dev *)info->par;

	dprintk(dev, 1, "Set blanking mode : %d\n", blank_mode);
	switch (blank_mode) {
	case FB_BLANK_UNBLANK:
		break;
	case FB_BLANK_NORMAL:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_POWERDOWN:
		break;
	}
	return 0;
}

static int vivid_fb_blank(int blank_mode, struct fb_info *info)
{
	struct vivid_dev *dev = (struct vivid_dev *)info->par;

	dprintk(dev, 1, "Set blanking mode : %d\n", blank_mode);
	switch (blank_mode) {
	case FB_BLANK_UNBLANK:
		break;
	case FB_BLANK_NORMAL:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_POWERDOWN:
		break;
	}
	return 0;
}
