xfrm: fix hw offload state leak on xfrm_do_migrate_state() error path

In the error path, the cloned state is dropped without removing its
hardware offload, leaking the offloaded SA entry.

Fixes: a9d155ea9b44 ("xfrm: add XFRM_MSG_MIGRATE_STATE for single SA migration")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>