Remove the useless `let` bindings

acme_common/src/crypto/openssl_keys.rs

@@ -99,7 +99,7 @@ impl KeyPair {
     }
 
     pub fn sign(&self, alg: &JwsSignatureAlgorithm, data: &[u8]) -> Result<Vec<u8>, Error> {
-        let _ = self.key_type.check_alg_compatibility(alg)?;
+        self.key_type.check_alg_compatibility(alg)?;
         match alg {
             JwsSignatureAlgorithm::Hs256
             | JwsSignatureAlgorithm::Hs384

acmed/src/acme_proto.rs

@@ -157,7 +157,7 @@ pub fn request_certificate(
                 // Tell the server the challenge has been completed
                 let chall_url = challenge.get_url();
                 let data_builder = set_data_builder!(account, endpoint_name, b"{}");
-                let _ = http::post_jose_no_response(endpoint, &data_builder, &chall_url)
+                http::post_jose_no_response(endpoint, &data_builder, &chall_url)
                     .map_err(HttpError::in_err)?;
             }
         }