pwm: zx: Add missing cleanup in error path

stable inclusion
from stable-5.10.4
commit 00fb97e2d7c8f05752699bce9ee1afe39523f949
bugzilla: 46903

--------------------------------

[ Upstream commit 269effd0 ]

zx_pwm_probe() called clk_prepare_enable() before; this must be undone
in the error path.

Fixes: 4836193c ("pwm: Add ZTE ZX PWM device driver")
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

drivers/pwm/pwm-zx.c

@@ -238,6 +238,7 @@ static int zx_pwm_probe(struct platform_device *pdev)
 	ret = pwmchip_add(&zpc->chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
+		clk_disable_unprepare(zpc->pclk);
 		return ret;
 	}