Use correct integer type when computing the maximum physical address

for kmem_alloc_contig().

Obtained from:	kmacy @
MFC after:	1 week
Sponsored by:	Mellanox Technologies

sys/compat/linuxkpi/common/include/linux/gfp.h

@@ -136,8 +136,8 @@ alloc_pages(gfp_t gfp_mask, unsigned int order)
 	size_t size;
 
 	size = PAGE_SIZE << order;
-	page = kmem_alloc_contig(kmem_arena, size, gfp_mask, 0, -1,
-	    size, 0, VM_MEMATTR_DEFAULT);
+	page = kmem_alloc_contig(kmem_arena, size, gfp_mask,
+	    0, ~(vm_paddr_t)0, size, 0, VM_MEMATTR_DEFAULT);
 	if (page == 0)
 		return (NULL);
         return (virt_to_page(page));