Jan Grulich 9caef2a8b8 Use a constant for invalid PipeWire file descriptor
We use value -1 on over all the places through our code so it might be
better to define a constant and use it instead to make the code more
understandable on first look.

Bug: webrtc:15203
Change-Id: I4fc3e561bc7a7778c43ec6cfde7acebef2af79e8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/306620
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Jan Grulich <grulja@gmail.com>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40156}
2023-05-26 11:38:49 +00:00
..
2023-01-16 14:36:06 +00:00