Minor tweak to silence an exception.

git-svn-id: http://svn.igniterealtime.org/svn/repos/wildfire/trunk/src/plugins/gateway@7272 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/wildfire/gateway/protocols/simple/SimpleSession.java

@@ -148,6 +148,7 @@ public class SimpleSession extends TransportSession {
 				udpSipProvider = sipStack.createSipProvider(udp);
 		} catch (Exception ex) {
 			Log.debug(ex);
+            return;
         }
 		
 		try {
@@ -156,12 +157,14 @@ public class SimpleSession extends TransportSession {
 			udpSipProvider.addSipListener(myListener);
 		} catch (TooManyListenersException ex) {
 			Log.debug(ex);
+            return;
         }
 		
 		try {
 			sipStack.start();
 		} catch (SipException ex) {
 			Log.debug(ex);
+            return;
         }
 		
 		seqNum = 1L;