[PATCH mptcp-next] mptcp: remove unused returned value

["Matthieu Baerts (NGI0)" <matttbe@kernel.org>]

When working on a fix modifying mptcp_check_data_fin(), I noticed the
returned value was no longer used.

It looks like it was used for 3 days, between commit 7ed90803a213
("mptcp: send explicit ack on delayed ack_seq incr") and commit
ea4ca586b16f ("mptcp: refine MPTCP-level ack scheduling").

This returned value can be safely removed.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/protocol.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 1c26acf6c4145896ecbb5c7f7004121c66a20649..f3dda47ad1d70b5c6a326c17dbe6d244c5638ca2 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -530,11 +530,10 @@ static void mptcp_cleanup_rbuf(struct mptcp_sock *msk, int copied)
 	}
 }
 
-static bool mptcp_check_data_fin(struct sock *sk)
+static void mptcp_check_data_fin(struct sock *sk)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
 	u64 rcv_data_fin_seq;
-	bool ret = false;
 
 	/* Need to ack a DATA_FIN received from a peer while this side
 	 * of the connection is in ESTABLISHED, FIN_WAIT1, or FIN_WAIT2.
@@ -572,12 +571,10 @@ static bool mptcp_check_data_fin(struct sock *sk)
 			break;
 		}
 
-		ret = true;
 		if (!__mptcp_check_fallback(msk))
 			mptcp_send_ack(msk);
 		mptcp_close_wake_up(sk);
 	}
-	return ret;
 }
 
 static void mptcp_dss_corruption(struct mptcp_sock *msk, struct sock *ssk)

---
base-commit: e9091ee333eb716a0933dcb08617228dcd3d3623
change-id: 20250906-check_data_fin_ret-6d284170880a

Best regards,
-- 
Matthieu Baerts (NGI0) <matttbe@kernel.org>