Input: max8997 - simplify open coding of a division using up to 64 divisions

The for loop is just a complicate way to express a division. Replace it
by the actual division which is both simpler to understand for a human
and more efficient for a CPU to calculate.
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20210316212233.50765-1-uwe@kleine-koenig.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/max8997_haptic.c

@@ -61,15 +61,10 @@ static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
 		unsigned int duty = chip->pwm_period * chip->level / 100;
 		ret = pwm_config(chip->pwm, duty, chip->pwm_period);
 	} else {
-		int i;
 		u8 duty_index = 0;
 
-		for (i = 0; i <= 64; i++) {
-			if (chip->level <= i * 100 / 64) {
-				duty_index = i;
-				break;
-			}
-		}
+		duty_index = DIV_ROUND_UP(chip->level * 64, 100);
+
 		switch (chip->internal_mode_pattern) {
 		case 0:
 			max8997_write_reg(chip->client,