drm/mediatek: dp: Reduce indentation in mtk_dp_bdg_detect()

In order to improve human readability, reduce the indentation by
returning early if the dp/edp cable is not plugged in.
Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Acked-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220916133821.27980-2-rex-bc.chen@mediatek.com

drivers/gpu/drm/mediatek/mtk_dp.c

@@ -1933,7 +1933,9 @@ static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
 	bool enabled = mtk_dp->enabled;
 	u8 sink_count = 0;
 
-	if (mtk_dp->train_info.cable_plugged_in) {
+	if (!mtk_dp->train_info.cable_plugged_in)
+		return ret;
+
 	if (!enabled) {
 		/* power on aux */
 		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
@@ -1965,7 +1967,7 @@ static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
 				   DP_PWR_STATE_BANDGAP_TPLL,
 				   DP_PWR_STATE_MASK);
 	}
-	}
+
 	return ret;
 }