crash into kdockwidget

[Laurent Montel]

Hi,
when I used kooka, and move dock widget, I obtained reproducted crash.
0x416df656 in waitpid () from /lib/i686/libpthread.so.0
#0  0x416df656 in waitpid () from /lib/i686/libpthread.so.0
#1  0x40b175c3 in KCrash::defaultCrashHandler(int) (sig=11) at kcrash.cpp:246
#2  0x416de4ec in __pthread_clock_settime () from /lib/i686/libpthread.so.0
#3  0x4177fca8 in __libc_sigaction () from /lib/i686/libc.so.6
#4  0x400bc0d2 in QWidget::width() const (this=0x0) at qwidget.h:742
#5  0x4092f804 in KDockManager::findDockWidgetAt(QPoint const&) (
    this=0x816f2f8, pos=@0xbfffeb00) at kdockwidget.cpp:1845
#6  0x4092f3c2 in KDockManager::eventFilter(QObject*, QEvent*) (
    this=0x816f2f8, obj=0x817ff78, event=0xbfffef60) at kdockwidget.cpp:1756


so I create a small patch to fix it.
Could you look at this patch please.

Regards.
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