Fix false positive may be uninitialized compiler warning

Author: iluuu1994

Zend/zend_objects.c

@@ -100,7 +100,7 @@ ZEND_API void zend_objects_destroy_object(zend_object *object)
 
 	if (destructor) {
 		zend_object *old_exception;
-		const zend_op *old_opline_before_exception;
+		const zend_op *old_opline_before_exception = NULL;
 
 		if (destructor->op_array.fn_flags & (ZEND_ACC_PRIVATE|ZEND_ACC_PROTECTED)) {
 			if (destructor->op_array.fn_flags & ZEND_ACC_PRIVATE) {