test: Use testing.T.Cleanup to remove tempdirs

internal/backend/rclone/backend_test.go

@@ -13,7 +13,7 @@ import (
 )
 
 func newTestSuite(t testing.TB) *test.Suite {
-	dir, cleanup := rtest.TempDir(t)
+	dir := rtest.TempDir(t)
 
 	return &test.Suite{
 		// NewConfig returns a config for a new temporary backend that will be used in tests.
@@ -43,13 +43,6 @@ func newTestSuite(t testing.TB) *test.Suite {
 			cfg := config.(rclone.Config)
 			return rclone.Open(cfg, nil)
 		},
-
-		// CleanupFn removes data created during the tests.
-		Cleanup: func(config interface{}) error {
-			t.Logf("cleanup dir %v", dir)
-			cleanup()
-			return nil
-		},
 	}
 }