Pass the destination File to the callback

The current argument is unused and it should have been removed
with commit 81229329f1
("Generate download clients using a builder class"). Instead of
removing it completely, use it to pass the File of the download.

src/org/lineageos/updater/UpdatesActivity.java

@@ -241,7 +241,7 @@ public class UpdatesActivity extends AppCompatActivity {
             }
 
             @Override
-            public void onSuccess(String response) {
+            public void onSuccess(File destination) {
                 runOnUiThread(new Runnable() {
                     @Override
                     public void run() {

src/org/lineageos/updater/UpdatesCheckReceiver.java

@@ -78,7 +78,7 @@ public class UpdatesCheckReceiver extends BroadcastReceiver {
                 }
 
                 @Override
-                public void onSuccess(String response) {
+                public void onSuccess(File destination) {
                     try {
                         if (json.exists() && Utils.checkForNewUpdates(json, jsonNew)) {
                             showNotification(context);

src/org/lineageos/updater/controller/UpdaterController.java

@@ -176,7 +176,7 @@ public class UpdaterController implements UpdaterControllerInt {
             }
 
             @Override
-            public void onSuccess(String body) {
+            public void onSuccess(File destination) {
                 Log.d(TAG, "Download complete");
                 UpdateDownload update = mDownloads.get(downloadId).mUpdate;
                 update.setStatus(UpdateStatus.VERIFYING);

src/org/lineageos/updater/download/DownloadClient.java

@@ -24,7 +24,7 @@ public interface DownloadClient {
     interface DownloadCallback {
         void onResponse(int statusCode, String url, Headers headers);
 
-        void onSuccess(String body);
+        void onSuccess(File destination);
 
         void onFailure(boolean cancelled);
     }

src/org/lineageos/updater/download/OkHttpDownloadClient.java

@@ -196,7 +196,7 @@ class OkHttpDownloadClient implements DownloadClient {
                     sink.writeAll(body.source());
                     Log.d(TAG, "Download complete");
                     sink.flush();
-                    mCallback.onSuccess(null);
+                    mCallback.onSuccess(mDestination);
                 } catch (IOException e) {
                     onFailure(request, e);
                 } finally {