coverity#1103731 Uncaught exception

Change-Id: Ia56720a1dbc209b048cb9285266e8d897b37cf29

canvas/source/opengl/ogl_spritecanvas.cxx

@@ -144,7 +144,8 @@ namespace oglcanvas
         return uno::Reference< rendering::XSprite >();
     }
 
-    sal_Bool SAL_CALL SpriteCanvas::updateScreen( sal_Bool bUpdateAll ) throw (uno::RuntimeException)
+    sal_Bool SAL_CALL SpriteCanvas::updateScreen(sal_Bool bUpdateAll)
+        throw (uno::RuntimeException, std::exception)
     {
         ::osl::MutexGuard aGuard( m_aMutex );
         return maDeviceHelper.showBuffer(mbIsVisible, bUpdateAll);

canvas/source/opengl/ogl_spritecanvas.hxx

@@ -93,7 +93,9 @@ namespace oglcanvas
         virtual ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XAnimatedSprite > SAL_CALL createSpriteFromBitmaps( const ::com::sun::star::uno::Sequence< ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XBitmap > >& animationBitmaps, ::sal_Int8 interpolationMode ) throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::rendering::VolatileContentDestroyedException, ::com::sun::star::uno::RuntimeException);
         virtual ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XCustomSprite > SAL_CALL createCustomSprite( const ::com::sun::star::geometry::RealSize2D& spriteSize ) throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::uno::RuntimeException);
         virtual ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XSprite > SAL_CALL createClonedSprite( const ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XSprite >& original ) throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::uno::RuntimeException);
-        virtual ::sal_Bool SAL_CALL updateScreen( ::sal_Bool bUpdateAll ) throw (::com::sun::star::uno::RuntimeException);
+        virtual ::sal_Bool SAL_CALL updateScreen( ::sal_Bool bUpdateAll )
+            throw (::com::sun::star::uno::RuntimeException,
+                   std::exception);
 
         // XServiceName
         virtual ::rtl::OUString SAL_CALL getServiceName(  ) throw (::com::sun::star::uno::RuntimeException);