add some go-critic suggestions

server/ctrladmin/ctrl.go

@@ -236,7 +236,8 @@ type Flash struct {
 	Type    FlashType
 }
 
-//nolint:gochecknoinits
+//nolint:gochecknoinits // for now I think it's nice that our types and their
+// gob registrations are next to each other, in case there's more added later)
 func init() {
 	gob.Register(&Flash{})
 }

server/ctrladmin/handlers_playlist.go

@@ -82,7 +82,7 @@ func (c *Controller) ServeUploadPlaylist(r *http.Request) *Response {
 }
 
 func (c *Controller) ServeUploadPlaylistDo(r *http.Request) *Response {
-	if err := r.ParseMultipartForm((1 << 10) * 24); nil != err {
+	if err := r.ParseMultipartForm((1 << 10) * 24); err != nil {
 		return &Response{
 			err:  "couldn't parse mutlipart",
 			code: 500,