findbugs: repeated condition seems c&p error the tested states sugest that EXPUNGED should be the last one

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

This closes apache#491

Author: DaanHoogland

server/src/com/cloud/storage/VolumeApiServiceImpl.java

@@ -1212,7 +1212,7 @@ public boolean deleteVolume(long volumeId, Account caller) throws ConcurrentOper
         }
 
         try {
-            if (volume.getState() != Volume.State.Destroy && volume.getState() != Volume.State.Expunging && volume.getState() != Volume.State.Expunging) {
+            if (volume.getState() != Volume.State.Destroy && volume.getState() != Volume.State.Expunging && volume.getState() != Volume.State.Expunged) {
                 Long instanceId = volume.getInstanceId();
                 if (!volService.destroyVolume(volume.getId())) {
                     return false;