[Libreoffice] [REVIEW] fix for a chart crasher

[Kohei Yoshida]

Please review this commit

http://cgit.freedesktop.org/libreoffice/calc/commit/?id=1e3b1a7a8c939a0ae08a14d5efdd65b17355dae9

for a cherry-pick candidate to libreoffice-3-3.  It's a very simple &
safe fix, and fixes a crasher as reported in

https://bugs.freedesktop.org/show_bug.cgi?id=34350

Thanks,

Kohei

-- 
Kohei Yoshida, LibreOffice hacker, Calc
<kyoshida at novell.com>