DRA resourceslices: clarify code

Using an else clause makes it more obvious that the code either creates a new
controller or calls Publish on an existing one, not both.

staging/src/k8s.io/dynamic-resource-allocation/kubeletplugin/draplugin.go

@@ -641,12 +641,11 @@ func (d *Helper) PublishResources(_ context.Context, resources resourceslice.Dri
 			}); err != nil {
 			return fmt.Errorf("start ResourceSlice controller: %w", err)
 		}
-		return nil
+	} else {
+		// Inform running controller about new information.
+		d.resourceSliceController.Update(driverResources)
 	}
 
-	// Inform running controller about new information.
-	d.resourceSliceController.Update(driverResources)
-
 	return nil
 }