alsaloop: only log xrun debug messages when verbose

alsa-project/alsa-utils pull request #302 was opened from jacmet:

Xruns can happen quite often (E.G. continuously when using alsaloop to/from the UAC gadget driver without a connected host), so only log the debug messages when verbose logging has been requested to not flood the logs.

Request URL : https://github.com/alsa-project/alsa-utils/pull/302 Patch URL : https://github.com/alsa-project/alsa-utils/pull/302.patch Repository URL: https://github.com/alsa-project/alsa-utils