CRAS: close server_event_fd in cras_client

Close server_event_fd when destroying a cras_client, which is created
by cras_client_create.

BUG=chromium:779500
TEST=Open multiple playback stream tabs in chrome and run command
     $ pid=`ps -ef | grep chrome | grep use-cras | awk '{ print $2}'`
     $ while true; do ls -l /proc/$pid/fd | grep eventfd | wc -l; sleep
       5; done
     to check if the number will decrease after closing a playback stream
     tab in chrome

Change-Id: I34ff31396e4b0089b53d6a32d9b1742f2c10a115
Reviewed-on: https://chromium-review.googlesource.com/1192605
Commit-Ready: Chih-Yang Hsia <paulhsia@chromium.org>
Tested-by: Chih-Yang Hsia <paulhsia@chromium.org>
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
1 file changed