tst_qzip: remove unused init()/cleanup() functions

Change-Id: I3502e8e20a4496051554dc6fb92ea9bd347cc0f7
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

tests/auto/gui/text/qzip/tst_qzip.cpp

@@ -39,9 +39,6 @@
 class tst_QZip : public QObject
 {
     Q_OBJECT
-public slots:
-    void init();
-    void cleanup();
 
 private slots:
     void basicUnpack();
@@ -50,14 +47,6 @@ private slots:
     void createArchive();
 };
 
-void tst_QZip::init()
-{
-}
-
-void tst_QZip::cleanup()
-{
-}
-
 void tst_QZip::basicUnpack()
 {
     QZipReader zip(QFINDTESTDATA("/testdata/test.zip"), QIODevice::ReadOnly);