[PATCH] m68knommu: checksum.h needs linux/in6.h

Need to include linux/in6.h in m68knommu checksum.h to get
a clean compile. All other architectures to this too.
Signed-off-by: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-m68knommu/checksum.h

 #ifndef _M68K_CHECKSUM_H
 #define _M68K_CHECKSUM_H
 
+#include <linux/in6.h>
+
 /*
  * computes the checksum of a memory block at buff, length len,
  * and adds in "sum" (32-bit)