use static_cast<cppu::OWeakObject*>(this) for exception's context

Instead of *this, as per advice of sbergman

Change-Id: Ibcac78974941d06de5cf865ddaed468ffdeccaa8

reportdesign/source/core/api/FixedLine.cxx

@@ -517,9 +517,9 @@ void SAL_CALL OFixedLine::setSize( const awt::Size& aSize ) throw (beans::Proper
     const char hundredthmmC[] = "0\xe2\x80\x89\xC2\xB5""m"; // in UTF-8: 0, thin space, µ (micro), m (meter)
     const rtl::OUString hundredthmm(hundredthmmC, sizeof(hundredthmmC)-1, RTL_TEXTENCODING_UTF8);
     if ( aSize.Width < MIN_WIDTH && m_nOrientation == 1 )
-        throw beans::PropertyVetoException("Too small width for FixedLine; minimum is "  + rtl::OUString::valueOf(static_cast<sal_Int32>(MIN_WIDTH))  + hundredthmm, *this);
+        throw beans::PropertyVetoException("Too small width for FixedLine; minimum is "  + rtl::OUString::valueOf(static_cast<sal_Int32>(MIN_WIDTH))  + hundredthmm, static_cast<cppu::OWeakObject*>(this));
     else if ( aSize.Height < MIN_HEIGHT && m_nOrientation == 0 )
-        throw beans::PropertyVetoException("Too small height for FixedLine; minimum is " + rtl::OUString::valueOf(static_cast<sal_Int32>(MIN_HEIGHT)) + hundredthmm, *this);
+        throw beans::PropertyVetoException("Too small height for FixedLine; minimum is " + rtl::OUString::valueOf(static_cast<sal_Int32>(MIN_HEIGHT)) + hundredthmm, static_cast<cppu::OWeakObject*>(this));
     OShapeHelper::setSize(aSize,this);
 }
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