B #1505: Removed delete nic (#1516)

(cherry picked from commit e8a888c564)

src/rm/RequestManagerVirtualRouter.cc

@@ -293,13 +293,10 @@ void VirtualRouterAttachNic::request_execute(
         {
             failure_response(ACTION, att);
 
-            delete nic;
             return;
         }
     }
 
-    delete nic;
-
     success_response(vrid, att);
 }