crypto: algif_aead - Fix minimum RX size check for decryption

crypto: algif_aead - Fix minimum RX size check for decryption

[ Upstream commit 3d14bd48e3a77091cbce637a12c2ae31b4a1687c ]

The check for the minimum receive buffer size did not take the
tag size into account during decryption.  Fix this by adding the
required extra length.

Reported-by: syzbot+aa11561819dc42ebbc7c@syzkaller.appspotmail.com
Reported-by: Daniel Pouzzner <douzzer@mega.nu>
Fixes: d887c52d6ae4 ("crypto: algif_aead - overhaul memory management")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>