xz: fix put_unaligned_{l,b}e32

Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

Sync code with busybox master fix
Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>