[PATCH] clean up default value of SYSCALL_DEBUG

Default values for boolean and tristate options can only be 'y', 'm' or 'n'.
This patch removes wrong default for SYSCALL_DEBUG.

Signed-off-by: Jean-Luc Leger <jean-luc.leger@dspnet.fr.eu.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>