clippy: fix redundant_else lint

Author: apoelstra

src/blind.rs

@@ -639,9 +639,8 @@ impl TxOut {
                     // unspendable.
                     if self.script_pubkey.is_provably_unspendable() {
                         return Err(TxOutError::ZeroValueCommitment);
-                    } else {
-                        return Err(TxOutError::NonUnspendableZeroValue);
                     }
+                    return Err(TxOutError::NonUnspendableZeroValue);
                 }
                 let asset_comm = self.get_asset_gen(secp)?;
                 Ok(PedersenCommitment::new_unblinded(secp, value, asset_comm))

src/pset/map/global.rs

@@ -464,9 +464,8 @@ impl Decodable for Global {
                                     let scalar = Tweak::from_slice(&prop_key.key)?;
                                     if scalars.contains(&scalar) {
                                         return Err(Error::DuplicateKey(raw_key).into());
-                                    } else {
-                                        scalars.push(scalar);
                                     }
+                                    scalars.push(scalar);
                                 } else {
                                     return Err(Error::InvalidKey(raw_key))?;
                                 }