Clean-up warnings in corelib/thread tests

Fixed the following warnings:

 - empty expression statement has no effect; remove unnecessary ';'
   to silence this warning
 - zero as null pointer constant
 - no previous extern declaration for non-static variable
 - use of old-style cast
 - integer conversion warnings

Change-Id: Ieb31b127ce8e3b543aaf88a8e8fc463dcc8bc4e3
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/auto/corelib/thread/qresultstore/tst_qresultstore.cpp b/tests/auto/corelib/thread/qresultstore/tst_qresultstore.cpp
index 6e0bbda2c2..dff599180c 100644
--- a/tests/auto/corelib/thread/qresultstore/tst_qresultstore.cpp
+++ b/tests/auto/corelib/thread/qresultstore/tst_qresultstore.cpp
@@ -535,7 +535,7 @@ void tst_QtConcurrentResultStore::pendingResultsDoNotLeak_data()
 void tst_QtConcurrentResultStore::pendingResultsDoNotLeak()
 {
     QFETCH(bool, filterMode);
-    CountedObject::LeakChecker leakChecker; Q_UNUSED(leakChecker);
+    CountedObject::LeakChecker leakChecker; Q_UNUSED(leakChecker)
 
     ResultStoreCountedObject store;
     store.setFilterMode(filterMode);