mm/mm_init.c: mark check_for_memory() as __init

The only caller of check_for_memory() is free_area_init(), which is
annotated with __init, so it should be safe to also mark the former as
__init.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Haifeng Xu <[email protected]>
Reviewed-by: Mike Rapoport (IBM) <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

mm/mm_init.c

@@ -1736,7 +1736,7 @@ static void __init free_area_init_node(int nid)
 }
 
 /* Any regular or high memory on that node ? */
-static void check_for_memory(pg_data_t *pgdat)
+static void __init check_for_memory(pg_data_t *pgdat)
 {
 	enum zone_type zone_type;