Always properly show exit status in phpdbg

Especially when it is only set after main run (e.g. register_shutdown_function)

sapi/phpdbg/phpdbg.c

@@ -1305,7 +1305,7 @@ int main(int argc, char **argv) /* {{{ */
 	zend_bool ext_stmt = 0;
 	zend_bool use_mm_wrappers = 0;
 	zend_bool is_exit;
-	int exit_status = 0;
+	int exit_status;
 
 #ifdef ZTS
 	void ***tsrm_ls;
@@ -1359,6 +1359,7 @@ phpdbg_main:
 	php_optind = 1;
 	opt = 0;
 	sapi_name = NULL;
+	exit_status = 0;
 	if (settings) {
 		exec = settings->exec;
 	}
@@ -1971,6 +1972,10 @@ phpdbg_out:
 			php_request_shutdown(NULL);
 		} zend_end_try();
 
+		if (exit_status == 0) {
+			exit_status = EG(exit_status);
+		}
+
 		if (!(PHPDBG_G(flags) & PHPDBG_IS_QUITTING)) {
 			if (PHPDBG_G(in_execution) || is_exit) {
 				if (!quit_immediately && !phpdbg_startup_run) {