drm/vc4: plane: Remove dead channels_scaled code

This code can never do anything, as channels_scaled can only be 0 or 2.
I suspect that the index was intended to be i rather than channel, but that
would trigger for scaled RGB planes, and halving lines is not wanted there.

Just remove it.

Author: popcornmix

drivers/gpu/drm/vc4/vc4_plane.c

@@ -813,7 +813,6 @@ static unsigned int vc4_lbm_channel_size(const struct drm_plane_state *state,
 {
 	const struct drm_format_info *info = state->fb->format;
 	const struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
-	unsigned int channels_scaled = 0;
 	unsigned int components, words, wpc;
 	unsigned int width, lines;
 	unsigned int i;
@@ -843,13 +842,6 @@ static unsigned int vc4_lbm_channel_size(const struct drm_plane_state *state,
 
 	lines = DIV_ROUND_UP(words, 128 / info->hsub);
 
-	for (i = 0; i < 2; i++)
-		if (vc4_state->y_scaling[channel] != VC4_SCALING_NONE)
-			channels_scaled++;
-
-	if (channels_scaled == 1)
-		lines = lines / 2;
-
 	return lines;
 }