Reduce unnecessary allocation

Author: sj-i

Zend/zend_inheritance.c

@@ -2274,20 +2274,21 @@ static bool do_trait_constant_check(
 static void do_inherit_trait_constant(zend_string *name, zend_class_constant *c, zend_class_entry *ce, zend_class_entry **traits, size_t current_trait) /* {{{ */
 {
 	if (do_trait_constant_check(ce, c, name, traits, current_trait)) {
-		zend_class_constant *ct;
+		zend_class_constant *ct = NULL;
 		if (Z_TYPE(c->value) == IS_CONSTANT_AST) {
 			ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
 			ce->ce_flags |= ZEND_ACC_HAS_AST_CONSTANTS;
 			if (traits[current_trait]->ce_flags & ZEND_ACC_IMMUTABLE) {
 				ct = zend_arena_alloc(&CG(arena), sizeof(zend_class_constant));
 				memcpy(ct, c, sizeof(zend_class_constant));
-				c = ct;
-				Z_CONSTANT_FLAGS(c->value) |= CONST_OWNED;
+				Z_CONSTANT_FLAGS(ct->value) |= CONST_OWNED;
 			}
 		}
 
-		ct = emalloc(sizeof(zend_class_constant));
-		memcpy(ct, c, sizeof(zend_class_constant));
+		if (!ct) {
+			ct = emalloc(sizeof(zend_class_constant));
+			memcpy(ct, c, sizeof(zend_class_constant));
+		}
 		c = ct;
 
 		c->ce = ce;