w1: fix redundant counter decrement in w1_attach_slave_device()

In w1_attach_slave_device(), if __w1_attach_slave_device() fails,
put_device() -> w1_slave_release() is called to do the cleanup job.
In w1_slave_release(), sl->family->refcnt and sl->master->slave_count
have already been decremented. There is no need to decrement twice
in w1_attach_slave_device().

Fixes: 2c927c0c73fd ("w1: Fix slave count on 1-Wire bus (resend)")
Cc: [e-mail]
Signed-off-by: Haoxiang Li <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

drivers/w1/w1.c

···
 	if (err < 0) {
 		dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
 			 sl->name);
-		dev->slave_count--;
-		w1_family_put(sl->family);
 		atomic_dec(&sl->master->refcnt);
 		kfree(sl);
 		return err;