Fix image save

app/src/main/java/com/hippo/io/UniFileOutputStreamPipe.java

@@ -34,11 +34,6 @@ public class UniFileOutputStreamPipe implements OutputStreamPipe {
         mUniFile = uniFile;
     }
 
-    @Override
-    public void obtain() {
-        // Empty
-    }
-
     @Override
     public void release() {
         // Empty