Fix issues found by FindBugs: GC_UNRELATED_TYPES
http://findbugs.sourceforge.net/bugDescriptions.html#GC_UNRELATED_TYPES

Change-Id: I744086323ed6c2b03d9e2853459ab1ae03fd87b2
diff --git a/src/main/java/net/onrc/onos/core/devicemanager/OnosDeviceManager.java b/src/main/java/net/onrc/onos/core/devicemanager/OnosDeviceManager.java
index 30ad722..a724caa 100644
--- a/src/main/java/net/onrc/onos/core/devicemanager/OnosDeviceManager.java
+++ b/src/main/java/net/onrc/onos/core/devicemanager/OnosDeviceManager.java
@@ -319,7 +319,7 @@
 
     @Override
     public void deleteOnosDeviceByMac(MACAddress mac) {
-        OnosDevice deleteDevice = mapDevice.get(mac);
+        OnosDevice deleteDevice = mapDevice.get(mac.toLong());
         deleteOnosDevice(deleteDevice);
     }