qmljs: put file specific logs in anonymous namespace

putting file specific log categories in anonymous namespace
avoid the possibility of nameclashes.

Change-Id: I17a07015ffe1c539824fcfcbc2296335d9225dd1
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/libs/qmljs/qmljssimplereader.cpp

@@ -39,8 +39,11 @@
 
 #include <QFile>
 
-namespace QmlJS{
+namespace {
 Q_LOGGING_CATEGORY(simpleReaderLog, "qtc.qmljs.simpleReader")
+}
+
+namespace QmlJS{
 
 QVariant SimpleReaderNode::property(const QString &name) const
 {