[PATCH] paride: rename pi_register() and pi_unregister()

We're about to change the semantics of pi_register()'s return value, so
rename it to something else first, so that any unconverted code reliaby
breaks.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>