[PATCH] silence initcall warnings

Suppress the initcall-return-value warnings unless initcall_debug was
specified.

They do find bugs, but they're extremely small ones and as Andi points out,
people get distressed.

Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>