VOL-4500: Fix trap-from-nni flow delete issues at openolt adapter

Change-Id: I19bd9b48e38ee2012e2cce5076aba9bb73d5a430
diff --git a/internal/pkg/core/openolt_flowmgr_test.go b/internal/pkg/core/openolt_flowmgr_test.go
index 7154225..af7b147 100644
--- a/internal/pkg/core/openolt_flowmgr_test.go
+++ b/internal/pkg/core/openolt_flowmgr_test.go
@@ -1609,6 +1609,16 @@
 			},
 			wantErr: false,
 		},
+		{
+			name: "RouteFlowToOnuChannel-11", // Test Remove trap-from-nni LLDP flow
+			args: args{
+				ctx:          ctx,
+				flow:         flow0,
+				addFlow:      false,
+				flowMetadata: &flowMetadata1,
+			},
+			wantErr: false,
+		},
 	}
 
 	var wg sync.WaitGroup