[Performance] [TypeDeclaration] No need check parent method when meth…

…od is private on AddVoidReturnTypeWhereNoReturnRector (rectorphp#5690)

* [TypeDeclaration] No need check parent method when method is private on AddVoidReturnTypeWhereNoReturnRector

* [TypeDeclaration] No need check parent method when method is private on AddVoidReturnTypeWhereNoReturnRector

rules-tests/TypeDeclaration/Rector/ClassMethod/AddVoidReturnTypeWhereNoReturnRector/Fixture/void_on_private_method.php.inc

@@ -0,0 +1,29 @@
+<?php
+
+namespace Rector\Tests\TypeDeclaration\Rector\ClassMethod\AddVoidReturnTypeWhereNoReturnRector\Fixture;
+
+final class VoidOnPrivateMethod
+{
+    private function getValues()
+    {
+        $value = 1000;
+        return;
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\TypeDeclaration\Rector\ClassMethod\AddVoidReturnTypeWhereNoReturnRector\Fixture;
+
+final class VoidOnPrivateMethod
+{
+    private function getValues(): void
+    {
+        $value = 1000;
+        return;
+    }
+}
+
+?>

src/VendorLocker/NodeVendorLocker/ClassMethodReturnVendorLockResolver.php

@@ -21,6 +21,10 @@ public function __construct(
 
     public function isVendorLocked(ClassMethod $classMethod): bool
     {
+        if ($classMethod->isPrivate()) {
+            return false;
+        }
+
         $classReflection = $this->reflectionResolver->resolveClassReflection($classMethod);
         if (! $classReflection instanceof ClassReflection) {
             return false;