memblock: use kfree() to release kmalloced memblock regions

memblock.{reserved,memory}.regions may be allocated using kmalloc() in
memblock_double_array(). Use kfree() to release these kmalloced regions
indicated by memblock_{reserved,memory}_in_slab.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Fixes: 3010f876 ("mm: discard memblock data later")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>

mm/memblock.c

@@ -366,6 +366,9 @@ void __init memblock_discard(void)
 		addr = __pa(memblock.reserved.regions);
 		size = PAGE_ALIGN(sizeof(struct memblock_region) *
 				  memblock.reserved.max);
+		if (memblock_reserved_in_slab)
+			kfree(memblock.reserved.regions);
+		else
 			memblock_free_late(addr, size);
 	}
 
@@ -373,6 +376,9 @@ void __init memblock_discard(void)
 		addr = __pa(memblock.memory.regions);
 		size = PAGE_ALIGN(sizeof(struct memblock_region) *
 				  memblock.memory.max);
+		if (memblock_memory_in_slab)
+			kfree(memblock.memory.regions);
+		else
 			memblock_free_late(addr, size);
 	}