TT#127805 remove temp transcoded files

* temp files created for transcoding operations
  are now correctly removed

Change-Id: Ie95fccd2ed2a533060e4abc2fa3593c9f951225a
(cherry picked from commit d3566d0aa8)

lib/NGCP/Panel/Role/API/SoundFiles.pm

@@ -24,7 +24,9 @@ sub transcode_data {
         $resource->{data} = NGCP::Panel::Utils::Sounds::transcode_file(
             $filename, uc($from_codec), $resource->{codec},
         );
+        unlink($filename);
     } catch($e) {
+        unlink($filename);
         $c->log->error("failed to transcode file: $e");
         $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Failed to transcode file");
         return;