V4L/DVB (11277): tvaudio: always call init_timer to prevent rmmod crash.

In the tvaudio_remove function del_timer_sync(&chip->wt) is called.
However, chip->wt isn't always initialized depending on the type of
audio chip. Since del_timer_sync hangs when given an uninitialized timer
we should always initialize it.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/tvaudio.c

@@ -2050,6 +2050,7 @@ static int tvaudio_probe(struct i2c_client *client, const struct i2c_device_id *
 	}
 
 	chip->thread = NULL;
+	init_timer(&chip->wt);
 	if (desc->flags & CHIP_NEED_CHECKMODE) {
 		if (!desc->getmode || !desc->setmode) {
 			/* This shouldn't be happen. Warn user, but keep working
@@ -2059,7 +2060,6 @@ static int tvaudio_probe(struct i2c_client *client, const struct i2c_device_id *
 			return 0;
 		}
 		/* start async thread */
-		init_timer(&chip->wt);
 		chip->wt.function = chip_thread_wake;
 		chip->wt.data     = (unsigned long)chip;
 		chip->thread = kthread_run(chip_thread, chip, client->name);