maple: Drop unused prototypes from linux/maple.h.

This patch removes the now unneeded registration check variable from
struct maple_device. (This patch assumes the include/linux/maple.h file
has already been patched for whitespace errors by
http://lkml.org/lkml/2008/2/6/327)
Signed-off-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/linux/maple.h

@@ -56,7 +56,6 @@ struct maple_device {
 	unsigned char port, unit;
 	char product_name[32];
 	char product_licence[64];
-	int registered;
 	struct device dev;
 };