avoid NULL casts, clang says casting nullptr_t is not allowed
closes #15660

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75162 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
avoid NULL casts, clang says casting nullptr_t is not allowed
closes #15660

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75162 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
use G_VALUE_INIT

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75163 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
use G_VALUE_INIT

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75163 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775