<stdarg.h> is not needed by these files, remove them.

[ Impact: cleanup ]
Signed-off-by: NWANG Cong <amwang@redhat.com>
Cc: akpm@linux-foundation.org
LKML-Reference: <20090512032956.5040.77055.sendpatchset@localhost.localdomain>
Signed-off-by: NIngo Molnar <mingo@elte.hu>