Bugfix: Remove duplicated subscriber reg. for receiving async msg

Change-Id: Idecde74a4d8e2586d33350168b1d6432204671e5
diff --git a/core/store/dist/src/main/java/org/onosproject/store/flow/impl/DistributedFlowRuleStore.java b/core/store/dist/src/main/java/org/onosproject/store/flow/impl/DistributedFlowRuleStore.java
index 699a4d3..f451712 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/flow/impl/DistributedFlowRuleStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/flow/impl/DistributedFlowRuleStore.java
@@ -337,8 +337,6 @@
         clusterCommunicator.addSubscriber(
                 REMOVE_FLOW_ENTRY, serializer::decode, this::removeFlowRuleInternal, serializer::encode, executor);
         clusterCommunicator.addSubscriber(
-                REMOVE_FLOW_ENTRY, serializer::decode, this::removeFlowRuleInternal, serializer::encode, executor);
-        clusterCommunicator.addSubscriber(
                 FLOW_TABLE_BACKUP, serializer::decode, flowTable::onBackupReceipt, serializer::encode, executor);
     }