Fix clippy warning

Author: ValuedMammal

src/wallet/error.rs

@@ -273,7 +273,8 @@ pub enum CreatePsbtError {
     /// Failed to create a spending plan for a manually selected output.
     Plan(OutPoint),
     /// Failed to create PSBT.
-    Psbt(bdk_tx::CreatePsbtError),
+    // TODO(@valuedmammal): `Box` shouldn't be needed once we can depend on `bdk_tx` 0.2.0.
+    Psbt(alloc::boxed::Box<bdk_tx::CreatePsbtError>),
     /// Selector error.
     Selector(bdk_tx::SelectorError),
     /// The UTXO of outpoint could not be found.

src/wallet/mod.rs

@@ -3062,7 +3062,7 @@ impl Wallet {
                 mandate_full_tx_for_segwit_v0: !params.only_witness_utxo,
                 sighash_type: params.sighash_type,
             })
-            .map_err(CreatePsbtError::Psbt)?;
+            .map_err(|e| CreatePsbtError::Psbt(Box::new(e)))?;
 
         // Add global xpubs.
         if params.add_global_xpubs {