pwm: atmel-hlcdc: Fix clock imbalance related to suspend support

The suspend callback disables the periph clock when the PWM is enabled
and resume reenables this clock if the PWM was disabled before. Judging
from the code comment it's suspend that is wrong here. Fix accordingly.

Fixes: f9bb9da7 ("pwm: atmel-hlcdc: Implement the suspend/resume hooks")
Reviewed-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Link: https://lore.kernel.org/r/b51ea92b0a45eff3dc83b08adefd43d930df996c.1706269232.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-atmel-hlcdc.c

@@ -185,7 +185,7 @@ static int atmel_hlcdc_pwm_suspend(struct device *dev)
 	struct atmel_hlcdc_pwm *atmel = dev_get_drvdata(dev);
 
 	/* Keep the periph clock enabled if the PWM is still running. */
-	if (pwm_is_enabled(&atmel->chip.pwms[0]))
+	if (!pwm_is_enabled(&atmel->chip.pwms[0]))
 		clk_disable_unprepare(atmel->hlcdc->periph_clk);
 
 	return 0;