[alsa-devel] upmix: complete generalizing format

[GitHub pull_request - opened]

alsa-project/alsa-plugins pull request #6 was opened from bku-sue:

Unfortunately these lines were overlooked in the [previous pull request](https://github.com/alsa-project/alsa-plugins/pull/2).

Request URL   : https://github.com/alsa-project/alsa-plugins/pull/6
Patch URL     : https://github.com/alsa-project/alsa-plugins/pull/6.patch
Repository URL: https://github.com/alsa-project/alsa-plugins