Fix some warnings in qtquick1 found by Clang

qml/qdeclarativevme.cpp:286:26: error: destination for this 'memset' call is a pointer to dynamic class 'QObject'; vtable pointer will be overwritten [-Werror,-Wdynamic-class-memaccess]
qml/qdeclarativemetatype.cpp:441:9: error: expression result unused; should this cast be to 'void'? [-Werror,-Wunused-value]
util/qdeclarativefontloader.cpp:87:52: error: addition of default argument on redeclaration makes this constructor a default constructor [-Werror,-Wdefault-arg-special-member]

Cherry-picked from qtquick1/99f138ad08101315cc871489c78cd10755b046b0

Change-Id: If0a690eacf9421f932214d2917cd3fa0a7daac9a
Reviewed-by: Thiago Macieira <[email protected]>
Reviewed-by: Alan Alpert <[email protected]>

Author: thiagomacieira

src/declarative/qml/qdeclarativemetatype.cpp

@@ -448,7 +448,7 @@ QObject *QDeclarativeType::create() const
     d->m_newFunc(rv);
 
     if (rv && !d->m_metaObjects.isEmpty())
-        (void *)new QDeclarativeProxyMetaObject(rv, &d->m_metaObjects);
+        (void)new QDeclarativeProxyMetaObject(rv, &d->m_metaObjects);
 
     return rv;
 }
@@ -461,7 +461,7 @@ void QDeclarativeType::create(QObject **out, void **memory, size_t additionalMem
     d->m_newFunc(rv);
 
     if (rv && !d->m_metaObjects.isEmpty())
-        (void *)new QDeclarativeProxyMetaObject(rv, &d->m_metaObjects);
+        (void)new QDeclarativeProxyMetaObject(rv, &d->m_metaObjects);
 
     *out = rv;
     *memory = ((char *)rv) + d->m_allocationSize;

src/declarative/qml/qdeclarativevme.cpp

@@ -283,7 +283,7 @@ QObject *QDeclarativeVME::run(QDeclarativeVMEObjectStack &stack,
             {
                 QObject *o = (QObject *)operator new(instr.createSimple.typeSize + 
                                                      sizeof(QDeclarativeData));   
-                ::memset(o, 0, instr.createSimple.typeSize + sizeof(QDeclarativeData));
+                ::memset(static_cast<void *>(o), 0, instr.createSimple.typeSize + sizeof(QDeclarativeData));
                 instr.createSimple.create(o);
 
                 QDeclarativeData *ddata = (QDeclarativeData *)(((const char *)o) + instr.createSimple.typeSize);

src/declarative/util/qdeclarativefontloader.cpp

@@ -64,7 +64,7 @@ class QDeclarativeFontObject : public QObject
 Q_OBJECT
 
 public:
-    QDeclarativeFontObject(int _id);
+    QDeclarativeFontObject(int _id = -1);
 
     void download(const QUrl &url, QNetworkAccessManager *manager);
 
@@ -84,7 +84,7 @@ private Q_SLOTS:
     Q_DISABLE_COPY(QDeclarativeFontObject)
 };
 
-QDeclarativeFontObject::QDeclarativeFontObject(int _id = -1)
+QDeclarativeFontObject::QDeclarativeFontObject(int _id)
     : QObject(0), id(_id), reply(0), redirectCount(0) {}