adhd: Fix memory leak in cras_client_unittest.cc

Free shm to prevent getting stuck in unittests with asan enable.

BUG=chromium:857597
TEST=FEATURE=test USE=asan emerge-amd64-generic adhd

Change-Id: I0a6ffa3ca99211a153b1abbae47db37b4ceaf7eb
Reviewed-on: https://chromium-review.googlesource.com/1126880
Commit-Ready: Chih-Yang Hsia <paulhsia@chromium.org>
Tested-by: Chih-Yang Hsia <paulhsia@chromium.org>
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
1 file changed