[IA64-SGI] snsc.c: snsc needs asm/sn/io.h

The sn system controller driver needs asm/sn/io.h in order to build correctly
(it was missing the numionodes declaration).
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

drivers/char/snsc.c

@@ -21,6 +21,7 @@
 #include <linux/poll.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <asm/sn/io.h>
 #include <asm/sn/sn_sal.h>
 #include <asm/sn/module.h>
 #include <asm/sn/geo.h>