Ensure that driver root is not empty

cmd/nvidia-ctk-installer/container/toolkit/toolkit.go

@@ -278,6 +278,11 @@ func (t *Installer) ValidateOptions(opts *Options) error {
 		opts.createDeviceNodes = *cli.NewStringSlice()
 	}
 
+	// Ensure that DriverRoot is set to "/" if empty.
+	if opts.DriverRoot == "" {
+		opts.DriverRoot = "/"
+	}
+
 	return nil
 }