test: Fix linter issues

These are some linter issues that were found in a new version of the
linter. Let's fix them now before that linter hits our test suite.

examples/lib/exec-send-recv.go

@@ -232,10 +232,7 @@ func Run() error {
 		}
 	}()
 
-	if err := obj.Run(); err != nil {
-		return err
-	}
-	return nil
+	return obj.Run()
 }
 
 func main() {