V4L/DVB (4222): Always switch tuner mode when calling VIDIOC_S_FREQUENCY.

Fixes the weird and incorrect condition in VIDIOC_S_FREQUENCY.
The tuner should always be switched to the mode specified in the
v4l2_frequency struct. Much simpler and also corresponding to the
v4l2 specification.
The old condition made it impossible to switch from radio to
analog tv mode using VIDIOC_S_FREQUENCY. Instead the (tv) frequency would
be given to the radio tuner.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/tuner-core.c

@@ -730,14 +730,10 @@ static int tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
 		{
 			struct v4l2_frequency *f = arg;
 
+			if (set_mode (client, t, f->type, "VIDIOC_S_FREQUENCY")
+					== EINVAL)
+				return 0;
 			switch_v4l2();
-			if ((V4L2_TUNER_RADIO == f->type && V4L2_TUNER_RADIO != t->mode)
-				|| (V4L2_TUNER_DIGITAL_TV == f->type
-					&& V4L2_TUNER_DIGITAL_TV != t->mode)) {
-				if (set_mode (client, t, f->type, "VIDIOC_S_FREQUENCY")
-					    == EINVAL)
-					return 0;
-			}
 			set_freq(client,f->frequency);
 
 			break;