qcacld-3.0: Use reg_is_chan_enum_invalid API to check for invalid channels

Currently the INVALID_CHANNEL assumes the value 0xBAD. When a channel list
array is indexed, there is an array out of bound error when the channel
list array is indexed using INVALID_CHANNEL or when the index is greater
than equal to NUM_CHANNELS. So a check for an invalid channel enum is
likely to be, (ch_enum == INVALID_CHANNEL) && (ch_enum  >= NUM_CHANNEL).

To address this issue, use reg_is_chan_enum_invalid API to check if
the channel is invalid.

Change-Id: Ie1fa97242607deff08d6987b955d2d88b534b44c
CRs-Fixed: 3271922

core/hdd/src/wlan_hdd_cfg80211.c

@@ -1317,7 +1317,7 @@ static qdf_freq_t wlan_hdd_get_adjacent_chan_freq(qdf_freq_t freq, bool upper)
 {
 	enum channel_enum ch_idx = wlan_reg_get_chan_enum_for_freq(freq);
 
-	if (ch_idx == INVALID_CHANNEL)
+	if (reg_is_chan_enum_invalid(ch_idx))
 		return -EINVAL;
 
 	if (upper && (ch_idx < (NUM_CHANNELS - 1)))

core/hdd/src/wlan_hdd_main.c

@@ -575,7 +575,8 @@ int hdd_validate_channel_and_bandwidth(struct hdd_adapter *adapter,
 		return -EINVAL;
 	}
 
-	if (INVALID_CHANNEL == wlan_reg_get_chan_enum_for_freq(chan_freq)) {
+	if (reg_is_chan_enum_invalid(
+			wlan_reg_get_chan_enum_for_freq(chan_freq))) {
 		hdd_err("Channel freq %d not in driver's valid channel list", chan_freq);
 		return -EOPNOTSUPP;
 	}

core/mac/src/pe/lim/lim_utils.c

@@ -3828,8 +3828,8 @@ void lim_update_sta_run_time_ht_switch_chnl_params(struct mac_context *mac,
 	chan_freq = wlan_reg_legacy_chan_to_freq(mac->pdev,
 						 pHTInfo->primaryChannel);
 
-	if (wlan_reg_get_chan_enum_for_freq(chan_freq) ==
-	    INVALID_CHANNEL) {
+	if (reg_is_chan_enum_invalid(
+			wlan_reg_get_chan_enum_for_freq(chan_freq))) {
 		pe_debug("Ignore Invalid channel in HT info");
 		return;
 	}