Cronet:优化预下载逻辑

app/src/main/java/io/legado/app/help/http/cronet/CronetLoader.java

@@ -156,8 +156,8 @@ public class CronetLoader extends CronetEngine.Builder.LibraryLoader {
 
 
     private static String getUrlMd5(String url) {
-        InputStream inputStream = null;
+        InputStream inputStream;
-        OutputStream outputStream = null;
+        OutputStream outputStream;
         try {
             outputStream = new ByteArrayOutputStream();
             HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();