[nrf fromlist] wifi: utils: Get correct channel count

For 2.4GHz and 6GHz bands, while counting the channels in configured
range, start of the range is being counted twice. Correct this
by advancing the index by 1 while counting channels in range.

Upstream PR: zephyrproject-rtos/zephyr#74063

Signed-off-by: Ravi Dondaputi <[email protected]>

Author: rado17

subsys/net/l2/wifi/wifi_utils.c

@@ -135,7 +135,7 @@ static int wifi_utils_get_all_chans_in_range(uint8_t chan_start,
 	case WIFI_FREQ_BAND_2_4_GHZ:
 		idx = *chan_idx;
 
-		for (i = chan_start; i <= chan_end; i++) {
+		for (i = chan_start+1; i <= chan_end; i++) {
 			band_chan[idx].band = band_idx;
 			band_chan[idx].channel = i;
 			idx++;
@@ -173,7 +173,7 @@ static int wifi_utils_get_all_chans_in_range(uint8_t chan_start,
 	case WIFI_FREQ_BAND_6_GHZ:
 		idx = *chan_idx;
 
-		i = chan_start;
+		i = chan_start+1;
 
 		while (i <= chan_end) {
 			band_chan[idx].band = band_idx;