powerpc: Guard htab_dt_scan_hugepage_blocks appropriately

htab_dt_scan_hugepage_blocks is only used when CONFIG_HUGETLB_PAGE is
defined, so guard the declaration likewise.
Signed-off-by: NTony Breeds <tony@bakeyournoodle.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/mm/hash_utils_64.c

@@ -343,6 +343,7 @@ static int __init htab_dt_scan_page_sizes(unsigned long node,
 	return 0;
 }
 
+#ifdef CONFIG_HUGETLB_PAGE
 /* Scan for 16G memory blocks that have been set aside for huge pages
  * and reserve those blocks for 16G huge pages.
  */
@@ -380,6 +381,7 @@ static int __init htab_dt_scan_hugepage_blocks(unsigned long node,
 	add_gpage(phys_addr, block_size, expected_pages);
 	return 0;
 }
+#endif /* CONFIG_HUGETLB_PAGE */
 
 static void __init htab_init_page_sizes(void)
 {