drm/sun4i: Fix debug message in DE2

Debug message would print "Enabling" even when disabling plane.

Fix it.

Fixes: 9d75b8c0 (drm/sun4i: add support for Allwinner DE2 mixers)
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171201060550.10392-5-jernej.skrabec@siol.net

drivers/gpu/drm/sun4i/sun8i_mixer.c

@@ -44,7 +44,8 @@ void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
 	/* Currently the first UI channel is used */
 	int chan = mixer->cfg->vi_num;
 
-	DRM_DEBUG_DRIVER("Enabling layer %d in channel %d\n", layer, chan);
+	DRM_DEBUG_DRIVER("%sabling layer %d in channel %d\n",
+			 enable ? "En" : "Dis", layer, chan);
 
 	if (enable)
 		val = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN;