m68knommu: Remove unnecessary prototype for kobjsize()

The prototype for kobjsize() is already defined in linux/mm.h which is
included where kobjsize() is used.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
diff --git a/arch/m68k/include/asm/pgtable_no.h b/arch/m68k/include/asm/pgtable_no.h
index c527fc2..11859b8 100644
--- a/arch/m68k/include/asm/pgtable_no.h
+++ b/arch/m68k/include/asm/pgtable_no.h
@@ -46,11 +46,6 @@
 #define ZERO_PAGE(vaddr)	(virt_to_page(0))
 
 /*
- * These would be in other places but having them here reduces the diffs.
- */
-extern unsigned int kobjsize(const void *objp);
-
-/*
  * No page table caches to initialise.
  */
 #define pgtable_cache_init()	do { } while (0)