Backport of "audio-buffer: Don't fail to map buffers with zero samples" into 1.16
requested to merge tpm/gst-plugins-base:backport-mr-496-into-1.16-audio-buffer-map-0-samples into 1.16
Backport of !496 (merged) "audio-buffer: Don't fail to map buffers with zero samples".
Commits:
- 89f613ab audio-buffer: Don't fail to map buffers with zero samples