Segfault in world map export

[Sergey Starosek]

JFYI, backtrace was:

Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff172db74 in fwrite () from /lib64/libc.so.6
> (gdb) bt
> #0  0x00007ffff172db74 in fwrite () from /lib64/libc.so.6
> #1  0x000000000044da11 in flush_buffer ()
> #2  0x000000000045b916 in export_worldmap_HTML ()
> #3  0x00000000004f00af in DiveLogExportDialog::on_buttonBox_accepted() ()
> #4  0x00000000004fe9ab in
> DiveLogExportDialog::qt_metacall(QMetaObject::Call, int, void**) ()
> #5  0x00007ffff2d69039 in QMetaObject::activate(QObject*, QMetaObject
> const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
> #6  0x00007ffff2d68e31 in QMetaObject::activate(QObject*, QMetaObject
> const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
> #7  0x00007ffff3c00bb2 in QAbstractButton::clicked(bool) () from
> /usr/lib64/qt4/libQtGui.so.4
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