Code review clean up

src/preferences/credentials.cpp

@@ -233,7 +233,7 @@ namespace preferences
 			filesystem::delete_file(filesystem::get_credentials_file());
 			return;
 		}
-		secure_buffer credentials_data(0, CREDENTIAL_SEPARATOR);
+		secure_buffer credentials_data;
 		for(const auto& cred : credentials) {
 			credentials_data.push_back(CREDENTIAL_SEPARATOR);
 			credentials_data.insert(credentials_data.end(), cred.username.begin(), cred.username.end());