qcacld-3.0: Add adapater validity check for get NUD stats command

Add adapter validity check for get NUD stats vendor command such that
after adapter down/close request is not sent down to FW over WMI which
can trigger FW assert.

Change-Id: Ia4809ce50f131d2a85e668681711d89c985203a0
CRs-Fixed: 2098149
diff --git a/core/hdd/src/wlan_hdd_cfg80211.c b/core/hdd/src/wlan_hdd_cfg80211.c
index 6f25faf..711036b 100644
--- a/core/hdd/src/wlan_hdd_cfg80211.c
+++ b/core/hdd/src/wlan_hdd_cfg80211.c
@@ -11195,6 +11195,10 @@
 	if (0 != err)
 		return err;
 
+	err = hdd_validate_adapter(adapter);
+	if (err)
+		return err;
+
 	arp_stats_params.pkt_type = WLAN_NUD_STATS_ARP_PKT_TYPE;
 	arp_stats_params.vdev_id = adapter->sessionId;