Fix NPE when logging remotesw in addRemoteSwitch().
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManager.java b/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManager.java
index c432987..f5ad9ac 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManager.java
+++ b/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManager.java
@@ -551,7 +551,7 @@
         	remoteport.setConfig(0); 
         	remoteport.setState(0);
         	remotesw.setPort(remoteport);
-        	log.debug("addRemoteSwitch(): added fake remote port {} to sw {}", remoteport, remotesw);
+        	log.debug("addRemoteSwitch(): added fake remote port {} to sw {}", remoteport, remotesw.getId());
         }
         
         return remotesw;