tpm: don't use flush_scheduled_work()

flush_scheduled_work() is deprecated and scheduled to be removed.
Directly flush chip->work instead.

Signed-off-by: Tejun Heo <[e-mail]>
Cc: Debora Velarde <[e-mail]>
Cc: Rajiv Andrade <[e-mail]>

drivers/char/tpm/tpm.c

···
 	struct tpm_chip *chip = file->private_data;
 
 	del_singleshot_timer_sync(&chip->user_read_timer);
-	flush_scheduled_work();
+	flush_work_sync(&chip->work);
 	file->private_data = NULL;
 	atomic_set(&chip->data_pending, 0);
 	kfree(chip->data_buffer);
···
 	ssize_t ret_size;
 
 	del_singleshot_timer_sync(&chip->user_read_timer);
-	flush_scheduled_work();
+	flush_work_sync(&chip->work);
 	ret_size = atomic_read(&chip->data_pending);
 	atomic_set(&chip->data_pending, 0);
 	if (ret_size > 0) {	/* relay data */