i2c: mediatek: remove redundant null check

Because clk_disable_unprepare already checked NULL clock parameter,
so the additional checks are unnecessary, just remove it
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Reviewed-by: Qii Wang <qii.wang@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-mt65xx.c

@@ -476,7 +476,6 @@ static int mtk_i2c_clock_enable(struct mtk_i2c *i2c)
 	return 0;
 
 err_arb:
-	if (i2c->have_pmic)
 	clk_disable_unprepare(i2c->clk_pmic);
 err_pmic:
 	clk_disable_unprepare(i2c->clk_main);
@@ -488,10 +487,8 @@ static int mtk_i2c_clock_enable(struct mtk_i2c *i2c)
 
 static void mtk_i2c_clock_disable(struct mtk_i2c *i2c)
 {
-	if (i2c->clk_arb)
 	clk_disable_unprepare(i2c->clk_arb);
 
-	if (i2c->have_pmic)
 	clk_disable_unprepare(i2c->clk_pmic);
 
 	clk_disable_unprepare(i2c->clk_main);