memblock: use kfree() to release kmalloced memblock regions

memblock: use kfree() to release kmalloced memblock regions

BugLink: https://bugs.launchpad.net/bugs/1963891
commit c94afc46cae7ad41b2ad6a99368147879f4b0e56 upstream.

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: 3010f876500f ("mm: discard memblock data later")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>