Initialize variable

Change-Id: Ibcccd93fd4654a087c323fde08dbadb64d22156c
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/corelib/io/qsettings.cpp

@@ -132,7 +132,7 @@ namespace {
         Path() {}
         Path(const QString & p, bool ud) : path(p), userDefined(ud) {}
         QString path;
-        bool userDefined; //!< true - user defined, overridden by setPath
+        bool userDefined = false; //!< true - user defined, overridden by setPath
     };
 }
 typedef QHash<int, Path> PathHash;