-fsanitize=bool (during CppunitTest_writerperfect_writer)

...as libwps::WPSDocument::isFileFormatSupported doesn't necessarily write false
into its needCharSetEncoding param ("A flag set to true if we need the character
set encoding"), whether or not that's a good idea.

Change-Id: Ib094a0fed84b6e6ff66e9b8a2524f55a60de64ef

writerperfect/source/writer/MSWorksImportFilter.cxx

@@ -37,7 +37,7 @@ bool MSWorksImportFilter::doImportDocument(librevenge::RVNGInputStream &rInput,
 {
     libwps::WPSKind kind = libwps::WPS_TEXT;
     libwps::WPSCreator creator;
-    bool needEncoding;
+    bool needEncoding = false;
     const libwps::WPSConfidence confidence = libwps::WPSDocument::isFileFormatSupported(&rInput, kind, creator, needEncoding);
 
     std::string fileEncoding("");