m68knommu: make non-MMU page_to_virt() return a void *

The page_to_virt() macro for m68knommu is currently effectively returning
an int type. But the equivilent m68k macro returns a void * virtual address.
Modify the non-MMU macro to return a void * as well (using the __va macro).

This change will remove compiler warnings in common m68k code that use this
macro.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

arch/m68k/include/asm/page_no.h

@@ -26,7 +26,7 @@ extern unsigned long memory_end;
 #define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
 
 #define virt_to_page(addr)	(mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
-#define page_to_virt(page)	((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
+#define page_to_virt(page)	__va(((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET))
 
 #define pfn_to_page(pfn)	virt_to_page(pfn_to_virt(pfn))
 #define page_to_pfn(page)	virt_to_pfn(page_to_virt(page))