Remove redundant field

Change-Id: I6a7adbce08e589e29763b1f7144d3a8d8742df9d
diff --git a/core/net/src/main/java/org/onosproject/net/flow/impl/FlowRuleManager.java b/core/net/src/main/java/org/onosproject/net/flow/impl/FlowRuleManager.java
index ccbbd4a..40829be 100644
--- a/core/net/src/main/java/org/onosproject/net/flow/impl/FlowRuleManager.java
+++ b/core/net/src/main/java/org/onosproject/net/flow/impl/FlowRuleManager.java
@@ -52,7 +52,6 @@
 import org.onosproject.net.flow.FlowRuleListener;
 import org.onosproject.net.flow.FlowRuleOperation;
 import org.onosproject.net.flow.FlowRuleOperations;
-import org.onosproject.net.flow.FlowRuleOperationsContext;
 import org.onosproject.net.flow.FlowRuleProvider;
 import org.onosproject.net.flow.FlowRuleProviderRegistry;
 import org.onosproject.net.flow.FlowRuleProviderService;
@@ -601,7 +600,6 @@
     private class FlowOperationsProcessor implements Runnable {
 
         private final List<Set<FlowRuleOperation>> stages;
-        private final FlowRuleOperationsContext context;
         private final FlowRuleOperations fops;
         private boolean hasFailed = false;
 
@@ -609,7 +607,6 @@
 
         FlowOperationsProcessor(FlowRuleOperations ops) {
             this.stages = Lists.newArrayList(ops.stages());
-            this.context = ops.callback();
             this.fops = ops;
         }
 
@@ -617,8 +614,8 @@
         public synchronized void run() {
             if (stages.size() > 0) {
                 process(stages.remove(0));
-            } else if (!hasFailed && context != null) {
-                context.onSuccess(fops);
+            } else if (!hasFailed && fops.callback() != null) {
+                fops.callback().onSuccess(fops);
             }
         }
 
@@ -654,12 +651,12 @@
                 operationsService.execute(this);
             }
 
-            if (context != null) {
+            if (fops.callback() != null) {
                 final FlowRuleOperations.Builder failedOpsBuilder =
                     FlowRuleOperations.builder();
                 failures.forEach(failedOpsBuilder::add);
 
-                context.onError(failedOpsBuilder.build());
+                fops.callback().onError(failedOpsBuilder.build());
             }
         }
     }