pam_systemd_home: minor coding style adjustment

src/home/pam_systemd_home.c

@@ -275,11 +275,11 @@ static int handle_generic_user_record_error(
                 const sd_bus_error *error,
                 bool debug) {
 
+        int r;
+
         assert(user_name);
         assert(error);
 
-        int r;
-
         /* Logs about all errors, except for PAM_CONV_ERR, i.e. when requesting more info failed. */
 
         if (sd_bus_error_has_name(error, BUS_ERROR_HOME_ABSENT)) {