VOL-1978 - add golangci invocation and fixed issues it highlighted

Change-Id: I86f438f84e8ab7fae499a163d599b699c472afda
diff --git a/pkg/filter/filter_test.go b/pkg/filter/filter_test.go
index 3a718e0..a776e49 100644
--- a/pkg/filter/filter_test.go
+++ b/pkg/filter/filter_test.go
@@ -219,7 +219,9 @@
 		},
 	}
 
-	f.Process(data)
+	if _, err = f.Process(data); err != nil {
+		t.Errorf("Error processing data")
+	}
 }
 
 func TestBadRE(t *testing.T) {