qcacld-3.0: Return proper error code when handling PMKSA

Currently only STA and SAP support PMKSA cache, and return
EOPNOTSUPP for other modes.

Change-Id: Ic8969ffd58815c4f3e2e5e286521421c38eb7f56
CRs-Fixed: 2747485

core/hdd/src/wlan_hdd_cfg80211.c

@@ -22083,7 +22083,10 @@ static int __wlan_hdd_cfg80211_flush_pmksa(struct wiphy *wiphy,
 		return errno;
 
 	status = wlan_hdd_flush_pmksa_cache(adapter);
-	if (QDF_IS_STATUS_ERROR(status)) {
+	if (status == QDF_STATUS_E_NOSUPPORT) {
+		errno = -EOPNOTSUPP;
+	}
+	else if (QDF_IS_STATUS_ERROR(status)) {
 		hdd_err("Cannot flush PMKIDCache");
 		errno = -EINVAL;
 	}