[media] v4l2-subdev.h: fix a doc nitpick warning

One markup tag is wrong here.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

include/media/v4l2-subdev.h

@@ -226,7 +226,7 @@ struct v4l2_subdev_core_ops {
  *
  * @g_tuner: callback for %VIDIOC_G_TUNER ioctl handler code.
  *
- * @s_tuner: callback for %VIDIOC_S_TUNER ioctl handler code. &vt->type must be
+ * @s_tuner: callback for %VIDIOC_S_TUNER ioctl handler code. @vt->type must be
  *	     filled in. Normally done by video_ioctl2 or the
  *	     bridge driver.
  *