Drop excess mut on `OnchainTxHandler::generate_external_htlc_claim`

diff --git a/lightning/src/chain/onchaintx.rs b/lightning/src/chain/onchaintx.rs
index b75349469f81bbd3df5a598a167be82ad5c86e44..9bfe6fa9af21b1547e5aa8bf2183062cde66f4cd 100644 (file)
--- a/lightning/src/chain/onchaintx.rs
+++ b/lightning/src/chain/onchaintx.rs
@@ -1047,7 +1047,7 @@ impl<ChannelSigner: Sign> OnchainTxHandler<ChannelSigner> {
 
        #[cfg(anchors)]
        pub(crate) fn generate_external_htlc_claim(
-               &mut self, outp: &::bitcoin::OutPoint, preimage: &Option<PaymentPreimage>
+               &self, outp: &::bitcoin::OutPoint, preimage: &Option<PaymentPreimage>
        ) -> Option<ExternalHTLCClaim> {
                let find_htlc = |holder_commitment: &HolderCommitmentTransaction| -> Option<ExternalHTLCClaim> {
                        let trusted_tx = holder_commitment.trust();