media: v4l2-subdev: remove wrong @cond from kdocs

v4l2_subdev_call() is unconditional, so don't mention in the docs a
@cond parameter which does not exist.

Signed-off-by: Wolfram Sang <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

include/media/v4l2-subdev.h

···
  * @sd: pointer to the &struct v4l2_subdev
  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
  *     Each element there groups a set of callbacks functions.
- * @f: callback function that will be called if @cond matches.
+ * @f: callback function to be called.
  *     The callback functions are defined in groups, according to
  *     each element at &struct v4l2_subdev_ops.
  * @args...: arguments for @f.