wxNotebook::DoRemovePage leads to a crash

This seems to fix the issue for me. Tested on Feisty wxwidgets2.6_2.6.3.2.1.5build1 with attached patch. Very simple and trivial patch, should be easy to backport for other distros if necessary.

patch taken from wxwidgets cvs
http://cvs.wxwidgets.org/viewcvs.cgi/wxWidgets/src/gtk/notebook.cpp.diff?only_with_tag=WX_2_6_BRANCH&r1=1.120.2.2&r2=1.120.2.3&diff_format=u
http://cvs.wxwidgets.org/viewcvs.cgi/wxWidgets/src/gtk/notebook.cpp?only_with_tag=WX_2_6_BRANCH

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Hash: SHA1

Format: 1.7
Date: Wed, 13 Dec 2006 22:35:54 +0200
Source: wxwidgets2.6
Binary: wx2.6-headers-msw python-wxversion libwxmsw2.6-dbg python-wxgtk2.6 libwxbase2.6-0 wx2.6-examples libwxgtk2.6-dbg python-wxgtk2.6-dbg wx2.6-doc python-wxtools libwxgtk2.6-dev wx2.6-headers wx2.6-i18n wx-common libwxbase2.6-dev libwxbase2.6-dbg libwxgtk2.6-0 libwxmsw2.6-dev
Architecture: source
Version: 2.6.3.2.1.5ubuntu1
Distribution: feisty
Urgency: low
Maintainer: Ron Lee <email address hidden>
Changed-By: Matti Lindell <email address hidden>
Description:
 libwxbase2.6-0 - wxBase library (runtime) - non-GUI support classes of wxWidgets t
 libwxbase2.6-dbg - wxBase library (debug) - non-GUI support classes of wxWidgets too
 libwxbase2.6-dev - wxBase library (development) - non-GUI support classes of wxWidge
 libwxgtk2.6-0 - wxWidgets Cross-platform C++ GUI toolkit (GTK+ runtime)
 libwxgtk2.6-dbg - wxWidgets Cross-platform C++ GUI toolkit (GTK+ development)
 libwxgtk2.6-dev - wxWidgets Cross-platform C++ GUI toolkit (GTK+ development)
 libwxmsw2.6-dbg - wxMSW mingw32msvc-cross (debug)
 libwxmsw2.6-dev - wxMSW mingw32msvc-cross
 python-wxgtk2.6 - wxWidgets Cross-platform C++ GUI toolkit (wxPython binding)
 python-wxgtk2.6-dbg - wxWidgets Cross-platform C++ GUI toolkit (wxPython binding)
 python-wxtools - wxWidgets Cross-platform C++ GUI toolkit (wxPython common files)
 python-wxversion - wxWidgets Cross-platform C++ GUI toolkit (wxPython version select
 wx-common - wxWidgets Cross-platform C++ GUI toolkit (common support files)
 wx2.6-doc - wxWidgets Cross-platform C++ GUI toolkit (documentation)
 wx2.6-examples - wxWidgets Cross-platform C++ GUI toolkit (examples)
 wx2.6-headers - wxWidgets Cross-platform C++ GUI toolkit (header files)
 wx2.6-headers-msw - Extra wxWidgets headers for mingw32msvc-cross
 wx2.6-i18n - wxWidgets Cross-platform C++ GUI toolkit (i18n support)
Changes:
 wxwidgets2.6 (2.6.3.2.1.5ubuntu1) feisty; urgency=low
 .
   * Fix for GTK warnings in wxNotebook::DoRemovePage
     (Closes: LP#59138)
Files:
 097f5ed2f29fdbb2c9ea0792c1e11087 1063 libs optional wxwidgets2.6_2.6.3.2.1.5ubuntu1.dsc
 70319c475acb3c4750d9cb31f63aae2e 15517001 libs optional wxwidgets2.6_2.6.3.2.1.5ubuntu1.tar.gz

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