Fix copy and paste error

Fix error 8 and 9 identified by static analysis from
http://www.viva64.com/en/b/0251/



Change-Id: I7f6741513814d8707e9dfe3402f970696238b8a3
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>

src/xmlpatterns/data/qduration.cpp

@@ -164,7 +164,7 @@ QString Duration::stringValue() const
         retval.append(QLatin1Char('D'));
     }
 
-    if(!m_hours && !m_minutes && !m_seconds && !m_seconds)
+    if(!m_hours && !m_minutes && !m_seconds && !m_mseconds)
     {
         if(!m_years && !m_months && !m_days)
             return QLatin1String("PT0S");
@@ -186,7 +186,7 @@ QString Duration::stringValue() const
         retval.append(QLatin1Char('M'));
     }
 
-    if(m_seconds || m_seconds)
+    if(m_seconds || m_mseconds)
     {
         retval.append(QString::number(m_seconds));