net: tls: fix async vs NIC crypto offload

When NIC takes care of crypto (or the record has already
been decrypted) we forget to update darg->async. ->async
is supposed to mean whether record is async capable on
input and whether record has been queued for async crypto
on output.
Reported-by: Gal Pressman <gal@nvidia.com>
Fixes: 3547a1f9 ("tls: rx: use async as an in-out argument")
Tested-by: Gal Pressman <gal@nvidia.com>
Link: https://lore.kernel.org/r/20220425233309.344858-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/tls/tls_sw.c

@@ -1562,6 +1562,7 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
 
 	if (tlm->decrypted) {
 		darg->zc = false;
+		darg->async = false;
 		return 0;
 	}
 
@@ -1572,6 +1573,7 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
 		if (err > 0) {
 			tlm->decrypted = 1;
 			darg->zc = false;
+			darg->async = false;
 			goto decrypt_done;
 		}
 	}