[reactos] 04/12: [SHELL32] Add check to CMenuToolbarBase::ShowDW

[Timo Kreuzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=d0c1df78821e6229f23e3b...

commit d0c1df78821e6229f23e3be1d638f550a8f83e45
Author:     Timo Kreuzer [e-mail]
AuthorDate: Tue Dec 13 10:30:48 2022 +0200
Commit:     Timo Kreuzer [e-mail]
CommitDate: Wed Jan 4 10:32:28 2023 +0100

[SHELL32] Add check to CMenuToolbarBase::ShowDW

This fixes an ATL assert in shell32_apitest:menu
---
 dll/win32/shell32/shellmenu/CMenuToolbars.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dll/win32/shell32/shellmenu/CMenuToolbars.cpp b/dll/win32/shell32/shellmenu/CMenuToolbars.cpp
index d99f5fc2e5f..0d5cd9ce514 100644
--- a/dll/win32/shell32/shellmenu/CMenuToolbars.cpp
+++ b/dll/win32/shell32/shellmenu/CMenuToolbars.cpp
@@ -315,6 +315,9 @@ void CMenuToolbarBase::InvalidateDraw()

HRESULT CMenuToolbarBase::ShowDW(BOOL fShow)
 {
+    if (m_hWnd == NULL)
+        return S_FALSE;
+
     ShowWindow(fShow ? SW_SHOW : SW_HIDE);

// Ensure that the right image list is assigned to the toolbar