valgrind: conditional jump depends on uninitialized data

load abi10122-1.doc and save as rtf

==8717== Conditional jump or move depends on uninitialised value(s)
==8717==    at 0x4E741D5: rtl_str_valueOfInt32 (strtmpl.cxx:682)
==8717==    by 0x2C3B4C6D: rtl::OStringBuffer::append(int, short) (strbuf.hxx:594)
==8717==    by 0x2C3AF36A: RtfAttributeOutput::FormatSurround(SwFmtSurround const&) (rtfattributeoutput.cxx:2840)
==8717==    by 0x2C4EA31B: AttributeOutputBase::OutputItem(SfxPoolItem const&) (ww8atr.cxx:5426)
==8717==    by 0x2C4D6EF8: MSWordExportBase::OutputItemSet(SfxItemSet const&, bool, bool, unsigned short, bool) (ww8atr.cxx:303)
==8717==    by 0x2C4D8D0B: MSWordExportBase::OutputFormat(SwFmt const&, bool, bool, bool) (ww8atr.cxx:872)
==8717==    by 0x2C3A9636: RtfAttributeOutput::OutputFlyFrame_Impl(sw::Frame const&, Point const&) (rtfattributeoutput.cxx:1702)
==8717==    by 0x2C450C95: AttributeOutputBase::OutputFlyFrame(sw::Frame const&) (wrtw8nds.cxx:2970)

Change-Id: I357e77f7a163fd9bb463d1a39f47381c23aa9eef