memnode.map is s16 array because of nodeid is 16 bit now.

so need to increase the nodemap_size according to that bits.
Signed-off-by: NYinghai Lu <yinghai.lu@sun.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>