adhd: Fix memory leaks in alsa_jack_unittest

(4/17 leaking tests for the issue)

Mixer will be free in alsa_card_destroy now, we should free it explicitly.

BUG=chromium:844092
TEST=Apply full patch set and run
FEATURES="test noclean nostrip" emerge-eve adhd
and
valgrind --leak-check=full --show-leak-kinds=all alsa_jack_unittest

Change-Id: I0d2aa037b6a071dc0982be7d63bd159e9bf096d8
Reviewed-on: https://chromium-review.googlesource.com/1067557
Commit-Ready: Chih-Yang Hsia <paulhsia@chromium.org>
Tested-by: Chih-Yang Hsia <paulhsia@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
1 file changed