3270 console driver changes:
 - Add error handling in 3270 device startup.
 - Do halt_io if startup has been interrupted.
 - Fix reference counting in tty timers.
 - Simplify set_timer functions.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>