Remaining kfree -> free_netdev replacements (easy part of free_netdev() fixes)

isa-skeleton.c got the same changes as actual ISA drivers - dynamic allocation,
leak fixes, clobbering fixes, fix for IO-before-request_region().

Plugged a bunch of leaks in sbni.  Replaced check_region() with intended
request_region() in pci probe (BTW, that bugger should be turned into
normal PCI driver at some point).

Sane allocation in sv11.  Switched it to SET_MODULE_OWNER(), while we are
at it.  Fixed a leak on exit and destroy-before-unregister race.

Now we can kill the embedding of net_device into hdlc_device.  Indeed,
all instances of hdlc_device are created by alloc_hdlcdev() and nothing
uses hdlc->netdev directly.  So we can
        * remove hdlc->netdev
        * have alloc_hdlcdev() implemented via alloc_netdev() with the rest
of hdlc_device as private part of net_device.
        * replace free_hdlcdev() with free_netdev().
        * have dev_to_hdlc(dev) simply return netdev_priv(dev).

No more users, we may remove it.

Killed embedded hdlc in dscc4 (same as for other drivers).  Fixed a
setup-after-registration race.

That was the last user of hdlc_to_dev(); killed.

Removed embedded hdlc in farsync (same as for wanxl and friends).
setup-after-registration race fixed.

Killed embedded hdlc in hd6457x.c derivatives (same as wanxl in previous
patch)

New field in hdlc_device: void *priv;
New helpers:
        struct net_device *alloc_hdlcdev(priv) allocates hdlc, sets ->priv and
returns pointer to hdlc->netdev
        free_hdlcdev(dev) takes such pointer and frees its hdlc.

wanxl switched to use of those; instead of embedding hdlc into card->ports[]
we allocate it separately right after card had been allocated and store pointer
to hdlc->netdev in card->ports[]->dev.  Freeing is done just before freeing
card.  Pointer back to card->ports[] is stored in hdlc->priv.  port_to_dev()
and dev_to_port() rewritten in the obvious way; by now the rest of driver
doesn't care whether hdlc is embedded or not - everything uses port_to_dev()
and dev_to_port().

That killed embedded hdlc replacing it with pointer to net_device.  Fairly
similar work will be done in the next few patches for other drivers.

Additionally, setup-after-register and free_irq()-before-unregister races
had been fixed.

register_hdlc_device()/unregister_hdlc_device() switched to net_device.
Now all remaining callers of hdlc_to_dev() are isolated and we can
start killing them.

New inlined helper - hdlc_stats().  A lot of places had it spelled out;
replaced with calls.

In pc300 replaced dev->hdlc with dev->dev (hdlc to net_device).  Killed a
bunch of ugliness in pc300_tty.c, killed hdlc_to_dev() uses.

Switched remaining ioctls to net_device, killed a bunch of hdlc_to_dev()
and killed hdlc_to_name().

Eliminated a bunch of ->netdev and hdlc_to_dev() uses.

More hd6457x.c massage: sca_open(), sca_close(), sca_dump_rings() switched
to net_device.  Bunch of hdlc_to_port() eliminated in favor of dev_to_port().

New helper in hd6457x.c: port_to_dev().  A bunch of port->hdlc eliminated.

Beginning of hdlc fixes.  hdlc_open() switched from hdlc_device to net_device.

Nothing is using lapb->token anymore; removed, along with the old "token"
argument of lapb_register().

lapb functions that used to take a token to select lapb_cb they'll deal with
are switched to getting net_device instead.  Callbacks switched to using
lapb->dev instead of lapb->token.

Beginning of lapb cleanups: lapb_register gets net_device along with the
"token" and it gets stored in lapb_cb (token argument will die later).