iio: adc: ad_pulsar: Clamp freq to values > 0

freq is used as a divisor, so better don't let it be zero.

Fixes: 44ffabe ("drivers: iio: adc: ad_pulsar: Add support for pulsar ADC's")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>

Author: ukleinek

drivers/iio/adc/ad_pulsar.c

@@ -427,7 +427,7 @@ static int ad_pulsar_set_samp_freq(struct ad_pulsar_adc *adc, int freq)
 	struct pwm_state cnv_state;
 	int ret;
 
-	freq = clamp(freq, 0, adc->info->max_rate);
+	freq = clamp(freq, 1, adc->info->max_rate);
 	target = DIV_ROUND_CLOSEST_ULL(adc->ref_clk_rate, freq);
 	ref_clk_period_ps = DIV_ROUND_CLOSEST_ULL(1000000000000,
 						  adc->ref_clk_rate);