Fix the assert

main/php_variables.c

@@ -68,7 +68,7 @@ PHPAPI void php_register_variable_ex(char *var_name, zval *val, zval *track_vars
 	zend_bool is_array = 0;
 	HashTable *symtable1 = NULL;
 
-	assert(var != NULL);
+	assert(var_name != NULL);
 	
 	if (track_vars_array) {
 		symtable1 = Z_ARRVAL_P(track_vars_array);