qcacld-3.0: Fix possible dereference of NULL pointer

Fix possible dereference of pkt_stats_dump being NULL

Change-Id: I7fd67b02c3b7cb4f1bfe7c6f4641f6d881e25abd
CRs-Fixed: 1086146

core/utils/logging/src/wlan_logging_sock_svc.c

@@ -1221,7 +1221,7 @@ void wlan_pkt_stats_to_logger_thread(void *pl_hdr, void *pkt_dump, void *data)
 
 	spin_lock_irqsave(&gwlan_logging.pkt_stats_lock, flags);
 
-	if (!gwlan_logging.pkt_stats_pcur_node) {
+	if (!gwlan_logging.pkt_stats_pcur_node || (NULL == pkt_stats_dump)) {
 		spin_unlock_irqrestore(&gwlan_logging.pkt_stats_lock, flags);
 		return;
 	}