CRAS: audio_thread - Refactor thread_find_stream and its usage.

The return value of thread_find_stream is not being used currently,
remove the temp variables.

BUG=None
TEST=cros_run_unit_tests --board=peppy --packages=adhd

Change-Id: Ie2c0d3f50ebc85d5f2ff0d09a12980d94c999f9c
Reviewed-on: https://chromium-review.googlesource.com/237357
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Tested-by: Chinyue Chen <chinyue@chromium.org>
Commit-Queue: Chinyue Chen <chinyue@chromium.org>
Trybot-Ready: Chinyue Chen <chinyue@chromium.org>
1 file changed