pwm: atmel-tcb: Use min() macro

Use the min() macro to simplify the atmel_tcb_pwm_apply() function
and improve its readability.

Signed-off-by: Shen Lichuan <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Uwe Kleine-König <[e-mail]>

drivers/pwm/pwm-atmel-tcb.c

···
 		return 0;
 	}
 
-	period = state->period < INT_MAX ? state->period : INT_MAX;
-	duty_cycle = state->duty_cycle < INT_MAX ? state->duty_cycle : INT_MAX;
+	period = min(state->period, INT_MAX);
+	duty_cycle = min(state->duty_cycle, INT_MAX);
 
 	ret = atmel_tcb_pwm_config(chip, pwm, duty_cycle, period);
 	if (ret)