Remove unreachable return statements from audio_device_alsa_linux.cc. This is blocking the chromium roll into webrtc. Bug: b/198565646 Change-Id: I6cd2a04d84f1ceabdba7b295e163b133869806fe Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/231122 Reviewed-by: Henrik Andreassson <henrika@webrtc.org> Commit-Queue: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/main@{#34902}