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.

test/shell/libmgmt-change1.go

@@ -167,10 +167,7 @@ func Run() error {
 		}
 	}()
 
-	if err := obj.Run(); err != nil {
-		return err
-	}
-	return nil
+	return obj.Run()
 }
 
 func main() {

test/shell/libmgmt-change2.go

@@ -180,10 +180,7 @@ func Run() error {
 		}
 	}()
 
-	if err := obj.Run(); err != nil {
-		return err
-	}
-	return nil
+	return obj.Run()
 }
 
 func main() {