[fix] Added call to WaitGroup's Done method in csi package (kubernetes#2511)

* fix: added call to WaitGroup's Done method

* fix: test comment

Author: meetmorrowsolonmars

go.mod

@@ -20,6 +20,7 @@ require (
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.15.0
 	github.com/stretchr/testify v1.8.4
+	go.uber.org/goleak v1.2.1
 	golang.org/x/net v0.17.0
 	golang.org/x/sys v0.13.0
 	golang.org/x/term v0.13.0