Overwrite __init section so calls to __init functions from normal code
are caught, reliably.

(Plus a fix from Dave Hansen)
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>