Make PMKID check easier for static analyzers

Checking sm->pmksa is sufficient here, but that seems to be too
difficult for static analyzers to follow, so avoid false reports by
explicitly checking pmkid as well.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/ap/wpa_auth_ie.c

@@ -675,7 +675,7 @@ int wpa_validate_wpa_ie(struct wpa_authenticator *wpa_auth,
 			break;
 		}
 	}
-	if (sm->pmksa) {
+	if (sm->pmksa && pmkid) {
 		wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
 				 "PMKID found from PMKSA cache "
 				 "eap_type=%d vlan_id=%d",