hostapd: Fix RADIUS client configuration update on reconfig

The internal pointer to RADIUS client configuration needs to be
updated whenever a new hostapd configuration is loaded. Without
this, freed memory may be dereferenced and this can result in
segmentation faults.

src/radius/radius_client.c

@@ -1489,3 +1489,11 @@ int radius_client_get_mib(struct radius_client_data *radius, char *buf,
 
 	return count;
 }
+
+
+void radius_client_reconfig(struct radius_client_data *radius,
+			    struct hostapd_radius_servers *conf)
+{
+	if (radius)
+		radius->conf = conf;
+}