fix: swap to_inner() for to_keypair()

Author: luisschwab

wallet/src/wallet/signer.rs

@@ -577,7 +577,7 @@ fn sign_psbt_schnorr(
     let keypair = match leaf_hash {
         None => keypair
             .tap_tweak(secp, psbt_input.tap_merkle_root)
-            .to_inner(),
+            .to_keypair(),
         Some(_) => keypair, // no tweak for script spend
     };
 

wallet/tests/psbt.rs

@@ -214,7 +214,7 @@ fn test_psbt_multiple_internalkey_signers() {
     let message = Message::from(sighash);
 
     // add tweak. this was taken from `signer::sign_psbt_schnorr`
-    let keypair = keypair.tap_tweak(&secp, None).to_inner();
+    let keypair = keypair.tap_tweak(&secp, None).to_keypair();
     let (xonlykey, _parity) = XOnlyPublicKey::from_keypair(&keypair);
 
     // Must verify if we used the correct key to sign