ASoC: es8328: Remove redundant null check before clk_disable_unprepare

Because clk_disable_unprepare() already checked NULL clock parameter,
so the additional check is unnecessary, just remove it.
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Link: https://lore.kernel.org/r/20210108085834.7168-1-vulab@iscas.ac.cnSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/es8328.c

@@ -809,8 +809,7 @@ static void es8328_remove(struct snd_soc_component *component)
 
 	es8328 = snd_soc_component_get_drvdata(component);
 
-	if (es8328->clk)
-		clk_disable_unprepare(es8328->clk);
+	clk_disable_unprepare(es8328->clk);
 
 	regulator_bulk_disable(ARRAY_SIZE(es8328->supplies),
 			       es8328->supplies);