Fix resource leak in wxMSW wxStaticBitmap when using RGBA icons.

Release the old handle if it wasn't freed by STM_SETIMAGE itself.

Closes #16068.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76141 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/statbmp.cpp

@@ -294,10 +294,10 @@ void wxStaticBitmap::SetImageNoCopy( wxGDIImage* image)
                   m_isIcon ? IMAGE_ICON : IMAGE_BITMAP, (LPARAM)handle);
     // detect if this is still the handle we passed before or
     // if the static-control made a copy of the bitmap!
-    if (m_currentHandle != 0 && oldHandle != (HGDIOBJ) m_currentHandle)
+    if (oldHandle != 0 && oldHandle != (HGDIOBJ) m_currentHandle)
     {
         // the static control made a copy and we are responsible for deleting it
-        DeleteObject((HGDIOBJ) oldHandle);
+        ::DeleteObject((HGDIOBJ) oldHandle);
     }
 
     // Save bitmap handle only if it's not a temporary one, otherwise it's