removed use of unstable Option::inspect

Author: Eugeny

russh/src/server/encrypted.rs

@@ -426,8 +426,9 @@ impl Encrypted {
                     debug!("signature = {:?}", signature);
                     let mut s = signature.reader(0);
                     let algo_ = s.read_string().map_err(crate::Error::from)?;
-                    key::SignatureHash::from_rsa_hostkey_algo(algo_)
-                        .inspect(|hash| pubkey.set_algorithm(*hash));
+                    if let Some(hash) = key::SignatureHash::from_rsa_hostkey_algo(algo_) {
+                        pubkey.set_algorithm(hash);
+                    }
                     debug!("algo_: {:?}", algo_);
                     let sig = s.read_string().map_err(crate::Error::from)?;
                     #[allow(clippy::indexing_slicing)] // length checked