system: sched_policy: Don't return an error when the thread we're trying to move exits on us

    sprintf(path, "/dev/cpuctl/%s/tasks", grp_name);

    if ((fd = open(path, O_WRONLY)) < 0) {

        LOGE("add_tid_to_cgroup failed to open '%s' (%s)\n", path, strerror(errno));

        LOGE("add_tid_to_cgroup failed to open '%s' (%s)\n", path,

             strerror(errno));

        return -1;

    }

    sprintf(text, "%d", tid);

    if (write(fd, text, strlen(text)) < 0) {

        close(fd);

	/*

	 * If the thread is in the process of exiting,

	 * don't flag an error

	 */

	if (errno == ESRCH)

		return 0;

        LOGW("add_tid_to_cgroup failed to write '%s' (%s)\n", path,

             strerror(errno));

        return -1;

    }