From coverity: client.getInetAddress() may return null

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@2258 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/ldap/LdapConnection.java

@@ -812,7 +812,8 @@ public class LdapConnection extends AbstractConnection {
 
     protected String getCurrentHostName() throws UnknownHostException {
         if (currentHostName == null) {
-            if (client.getInetAddress().isLoopbackAddress()) {
+            InetAddress clientInetAddress = client.getInetAddress();
+            if (clientInetAddress != null && clientInetAddress.isLoopbackAddress()) {
                 // local address, probably using localhost in iCal URL
                 currentHostName = "localhost";
             } else {