Use wxDELETE() and wxDELETEA() when possible.

Use wxDELETE[A]() functions which automatically NULL out their arguments after
deleting them instead of doing it manually.

Closes #9685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64656 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/app.cpp

@@ -386,8 +386,7 @@ bool wxApp::RegisterWindowClasses( HAB vHab )
 //
 void wxApp::CleanUp()
 {
-    delete[] wxBuffer;
-    wxBuffer = NULL;
+    wxDELETEA(wxBuffer);
 
     //
     // PM-SPECIFIC CLEANUP
@@ -414,8 +413,7 @@ void wxApp::CleanUp()
 // TODO:        ::DeleteObject( wxDisableButtonBrush );
     }
 
-    delete wxWinHandleHash;
-    wxWinHandleHash = NULL;
+    wxDELETE(wxWinHandleHash);
 
     // Delete Message queue
     if (wxTheApp->m_hMq)

src/os2/bitmap.cpp

@@ -84,11 +84,7 @@ void wxBitmapRefData::Free()
             wxLogLastError(wxT("GpiDeleteBitmap(hbitmap)"));
         }
     }
-    if (m_pBitmapMask)
-    {
-        delete m_pBitmapMask;
-        m_pBitmapMask = NULL;
-    }
+    wxDELETE(m_pBitmapMask);
 } // end of wxBitmapRefData::Free
 
 // ----------------------------------------------------------------------------

src/os2/dialog.cpp

@@ -180,11 +180,7 @@ bool wxDialog::Show( bool bShow )
         // and we will lose activation
         m_modalData->ExitLoop();
 #if 0
-        if (m_pWindowDisabler)
-        {
-            delete m_pWindowDisabler;
-            m_pWindowDisabler = NULL;
-        }
+        wxDELETE(m_pWindowDisabler);
 #endif
     }
 

src/os2/listctrl.cpp

@@ -140,8 +140,7 @@ public:
 
     ~CListItemInternalData()
     {
-        delete m_pAttr;
-        m_pAttr = NULL;
+        wxDELETE(m_pAttr);
     }
 
     wxListItemAttr*                 m_pAttr;
@@ -965,8 +964,7 @@ wxListCtrl::~wxListCtrl ()
     {
         m_pTextCtrl->SetHWND(0);
         m_pTextCtrl->UnsubclassWin();
-        delete m_pTextCtrl;
-        m_pTextCtrl = NULL;
+        wxDELETE(m_pTextCtrl);
     }
 
     if (m_bOwnsImageListNormal)

src/os2/settings.cpp

@@ -70,8 +70,7 @@ void wxSystemSettingsModule::OnExit()
 {
     sm_optionNames.Clear();
     sm_optionValues.Clear();
-    delete gs_fontDefault;
-    gs_fontDefault = NULL;
+    wxDELETE(gs_fontDefault);
 }
 
 wxColour wxSystemSettingsNative::GetColour(

src/os2/statbmp.cpp

@@ -141,9 +141,7 @@ bool wxStaticBitmap::ImageIsOk() const
 
 void wxStaticBitmap::Free()
 {
-    if (m_pImage)
-        delete m_pImage;
-    m_pImage = NULL;
+    wxDELETE(m_pImage);
 } // end of wxStaticBitmap::Free
 
 wxSize wxStaticBitmap::DoGetBestSize() const

src/os2/toolbar.cpp

@@ -423,11 +423,7 @@ bool wxToolBar::Create( wxWindow* pParent,
 
 wxToolBar::~wxToolBar()
 {
-    if (m_pToolTip)
-    {
-        delete m_pToolTip;
-        m_pToolTip = NULL;
-    }
+    wxDELETE(m_pToolTip);
 } // end of wxToolBar::~wxToolBar
 
 bool wxToolBar::Realize()

src/os2/treectrl.cpp

@@ -80,11 +80,7 @@ public:
     wxTreeItemInternalData() {}
     ~wxTreeItemInternalData()
     {
-        if(m_pAttr)
-        {
-            delete m_pAttr;
-            m_pAttr = NULL;
-        }
+        wxDELETE(m_pAttr);
     }
 
     wxTreeItemAttr*                 m_pAttr;

src/os2/window.cpp

@@ -3038,11 +3038,7 @@ bool wxWindowOS2::HandleDestroy()
     // Delete our drop target if we've got one
     //
 #if wxUSE_DRAG_AND_DROP
-    if (m_dropTarget != NULL)
-    {
-        delete m_dropTarget;
-        m_dropTarget = NULL;
-    }
+    wxDELETE(m_dropTarget);
 #endif // wxUSE_DRAG_AND_DROP
 
     //