[PATCH] clean up therm_adt746x

This patch cleans therm_adt746x a bit: lines at maximum 80 chars width,
dispatches the big function in three little ones.

Functionality not changed.
Signed-off-by: Colin Leroy <colin@colino.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>