Bug Fixes:

* Fix transmit end of message (EOM) processing to work correctly with
  hardware auto CTS feature

* Fix oops in error path if hardware diags fail during device
  initialization

Cosmetic change:

* Use existing macros for address space size instead of hardcoded values
Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>