media: em28xx: Fix misplaced reset of dev->v4l::field_count

The backport of commit afeaade9 "media: em28xx: make
v4l2-compliance happier by starting sequence on zero" added a
reset on em28xx_v4l2::field_count to em28xx_enable_analog_tuner()
but it should be done in em28xx_start_analog_streaming().
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/media/usb/em28xx/em28xx-video.c

@@ -900,8 +900,6 @@ static int em28xx_enable_analog_tuner(struct em28xx *dev)
 	if (!mdev || !v4l2->decoder)
 		return 0;
 
-	dev->v4l2->field_count = 0;
-
 	/*
 	 * This will find the tuner that is connected into the decoder.
 	 * Technically, this is not 100% correct, as the device may be
@@ -1074,6 +1072,8 @@ int em28xx_start_analog_streaming(struct vb2_queue *vq, unsigned int count)
 
 	em28xx_videodbg("%s\n", __func__);
 
+	dev->v4l2->field_count = 0;
+
 	/* Make sure streaming is not already in progress for this type
 	   of filehandle (e.g. video, vbi) */
 	rc = res_get(dev, vq->type);