qcacld-3.0: OOB access may occur due to total numChannels exceeds max value

Out of Buffer access may occur in wmi_get_buf_extscan_start_cmd()
function if user provided inputs are different for below parameters
which are assigned in hdd_extscan_start_fill_bucket_channel_spec()
function

1. QCA_WLAN_VENDOR_ATTR_EXTSCAN_BUCKET_SPEC_NUM_CHANNEL_SPECS
2. QCA_WLAN_VENDOR_ATTR_EXTSCAN_CHANNEL_SPEC

To address this issue return failure status if numChannels is not
equal to the total number of channel entries.

Change-Id: I60d74161dc3752bd7f609af3910d7c86a99488ec
CRs-Fixed: 2255189

core/hdd/src/wlan_hdd_ext_scan.c

@@ -3042,6 +3042,11 @@ static int hdd_extscan_start_fill_bucket_channel_spec(
 			total_channels++;
 		}
 
+		if (j != req_msg->buckets[bkt_index].numChannels) {
+			hdd_err("Input parameters didn't match");
+			return -EINVAL;
+		}
+
 		hdd_extscan_update_dwell_time_limits(
 					req_msg, bkt_index,
 					min_dwell_time_active_bucket,