crypto: algif_aead - Fix kernel panic on list_del

Kernel panics when userspace program try to access AEAD interface.
Remove node from Linked List before freeing its memory.

Cc: <stable@vger.kernel.org>
Signed-off-by: Harsh Jain <harsh@chelsio.com>
Reviewed-by: Stephan Müller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>