Remove unused var

controllers/logo.go

@@ -67,10 +67,6 @@ func GetCompatibleLogo(w http.ResponseWriter, r *http.Request) {
 	cacheTime := utils.GetCacheDurationSecondsForPath(imagePath)
 	writeBytesAsImage(imageBytes, contentType, w, cacheTime)
 
-	referrer := r.Referer()
-	if referrer == "" {
-		referrer = "an external site"
-	}
 	if !_hasWarnedSVGLogo {
 		log.Warnf("an external site requested your logo. because many social networks do not support SVGs we returned a placeholder instead. change your current logo to a png or jpeg to be most compatible with external social networking sites.")
 		_hasWarnedSVGLogo = true