Fixed warning message if QMetaObjectCleanUp::setMetaObject is invoked twice.

If the passed object is the same, the warning message is not displayed any more.
If the passed object is different, a message is still displayed.
This resolves bug 1887.

src/kernel/qmetaobject.cpp

@@ -1244,7 +1244,7 @@ TQMetaObjectCleanUp::~TQMetaObjectCleanUp()
 void TQMetaObjectCleanUp::setMetaObject( TQMetaObject *&mo )
 {
 #if defined(QT_CHECK_RANGE)
-    if ( metaObject )
+    if (metaObject && metaObject != &mo)
 	tqWarning( "TQMetaObjectCleanUp::setMetaObject: Double use of TQMetaObjectCleanUp!" );
 #endif
     metaObject = &mo;