chore: lint fixes

internal/plugin/domainblock/domainblock_test.go

@@ -127,11 +127,11 @@ func TestOnMessage(t *testing.T) {
 			responses := plugin.OnMessage(msg, config)
 
 			if test.expectBlocked {
-				if responses == nil || len(responses) == 0 {
+				if len(responses) == 0 {
 					t.Errorf("Expected message to be blocked, but it wasn't")
 				}
 			} else {
-				if responses != nil && len(responses) > 0 {
+				if len(responses) > 0 {
 					t.Errorf("Expected message not to be blocked, but it was")
 				}
 			}