tst_QMetaType: fix warning that buffer may be unused

We pass a pointer to uninitialized memory to QMetaType::create().
There's no harm because we're using the invalid QMetaType, but GCC is
actually right to complain for any other type.

qtestcase.h:54:25: warning: ‘buf’ may be used uninitialized [-Wmaybe-uninitialized]
qmetatype.h:454:11: note: by argument 2 of type ‘const void*’ to ‘void* QMetaType::create(const void*) const’ declared here

Pick-to: 6.3 6.4
Change-Id: I3859764fed084846bcb0fffd1703eb7967acf0d7
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
index dc7936cb23..4565e78985 100644
--- a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
+++ b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
@@ -817,7 +817,7 @@ void tst_QMetaType::createCopy()
             switch (type) {
             case QMetaType::UnknownType:
                 return []() {
-                    char buf[1];
+                    char buf[1] = {};
                     QCOMPARE(QMetaType().create(&buf), nullptr);
                 };
 #define RETURN_CREATE_COPY_FUNCTION(MetaTypeName, MetaTypeId, RealType) \
@@ -1412,7 +1412,7 @@ void tst_QMetaType::constructCopy()
             switch (type) {
             case QMetaType::UnknownType:
                 return []() {
-                    char buf[1], buf2[1];
+                    char buf[1], buf2[1] = {};
                     QCOMPARE(QMetaType().construct(&buf, &buf2), nullptr);
                 };
 #define RETURN_CONSTRUCT_COPY_FUNCTION(MetaTypeName, MetaTypeId, RealType) \