categorize.cpp: Fixed conversion

Fixed conversion from xmlChar to string.

src/categorize.cpp

@@ -20,7 +20,7 @@ void categorizeXml(const char *xmlFile, map<string, set<string> >& M) {
              if ( xmlTextReaderHasAttributes(reader) == 1 ) {
                  node.category = xmlTextReaderGetAttribute(reader, xmlCharStrdup("category"));
                  node.media = xmlTextReaderGetAttribute(reader, xmlCharStrdup("media"));
-                 category = (char *)node.category;
+                 category = QString().fromUtf8((char *)node.category).toStdString();
                  media = QString().fromUtf8((char *)node.media).toStdString();
                  M[media].insert(category);
              }