qcacld-3.0: Add null check for logging PMKSA BSSID

When wlan_hdd_del_mksa_cache is not successful, it prints a failure
message with the PMKSA BSSID without checking whether it is null,
causing it to access a null pointer. Add a null check for PMKSA BSSID
using it in the log.

Change-Id: I7c2f67fe709c61d5371635950021cb8687175245
CRs-Fixed: 2621607

core/hdd/src/wlan_hdd_cfg80211.c

@@ -21417,8 +21417,11 @@ static int __wlan_hdd_cfg80211_del_pmksa(struct wiphy *wiphy,
 	/* Delete the PMKID CSR cache */
 	if (QDF_STATUS_SUCCESS !=
 	    wlan_hdd_del_pmksa_cache(adapter, pmk_cache)) {
-		hdd_err("Failed to delete PMKSA for " QDF_MAC_ADDR_STR,
-		       QDF_MAC_ADDR_ARRAY(pmksa->bssid));
+		if (!pmksa->bssid)
+			hdd_err("Failed to delete PMKSA for null bssid");
+		else
+			hdd_err("Failed to delete PMKSA for " QDF_MAC_ADDR_STR,
+				QDF_MAC_ADDR_ARRAY(pmksa->bssid));
 		status = -EINVAL;
 	}