V4L/DVB (6215): Bugfix for saa6588.c, add forgotten spin_lock_init()

There's a serious bug in saa6588.c, it uses a non-initialized spin_lock.
Funny thing is that it works fine with bttv, but completly freezes the
machine if e.g. saa7134 is loaded.

Thanks to Derek Philip for reporting this bug on the rdsd-devel list.

This patch adds the missing spin_lock_init().
Signed-off-by: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/saa6588.c

@@ -406,6 +406,7 @@ static int saa6588_attach(struct i2c_adapter *adap, int addr, int kind)
 		kfree(s);
 		return -ENOMEM;
 	}
+	spin_lock_init(&s->lock);
 	s->client = client_template;
 	s->block_count = 0;
 	s->wr_index = 0;