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 <[e-mail]>
Fixes: 3010f876500f ("mm: discard memblock data later")
Signed-off-by: Mike Rapoport <[e-mail]>

mm/memblock.c

···
 		addr = __pa(memblock.reserved.regions);
 		size = PAGE_ALIGN(sizeof(struct memblock_region) *
 				  memblock.reserved.max);
-		memblock_free_late(addr, size);
+		if (memblock_reserved_in_slab)
+			kfree(memblock.reserved.regions);
+		else
+			memblock_free_late(addr, size);
 	}
 
 	if (memblock.memory.regions != memblock_memory_init_regions) {
 		addr = __pa(memblock.memory.regions);
 		size = PAGE_ALIGN(sizeof(struct memblock_region) *
 				  memblock.memory.max);
-		memblock_free_late(addr, size);
+		if (memblock_memory_in_slab)
+			kfree(memblock.memory.regions);
+		else
+			memblock_free_late(addr, size);
 	}
 
 	memblock_memory = NULL;