Remove from ongoing downloads even if failed

downloader/download_downloadr.go

@@ -23,6 +23,11 @@ func DownloadR(url string) error {
 	ongoingDownloadsMutex.Lock()
 	ongoingDownloads[url] = struct{}{}
 	ongoingDownloadsMutex.Unlock()
+	defer func() {
+		ongoingDownloadsMutex.Lock()
+		delete(ongoingDownloads, url)
+		ongoingDownloadsMutex.Unlock()
+	}()
 
 	log.Printf("Downloading %s", url)
 
@@ -76,9 +81,6 @@ func DownloadR(url string) error {
 	}
 
 	log.Printf("Downloaded %s", url)
-	ongoingDownloadsMutex.Lock()
-	delete(ongoingDownloads, url)
-	ongoingDownloadsMutex.Unlock()
 	return nil
 }