Close file stream

app/src/main/java/eu/faircode/email/ActivityBase.java

@@ -574,7 +574,9 @@ abstract class ActivityBase extends AppCompatActivity implements SharedPreferenc
             if (is == null)
                 throw new FileNotFoundException(uri.toString());
 
-            Helper.copy(is, new FileOutputStream(file));
+            try (FileOutputStream fos = new FileOutputStream(file)) {
+                Helper.copy(is, fos);
+            }
 
             return FileProviderEx.getUri(this, BuildConfig.APPLICATION_ID, file);
         } catch (Throwable ex) {