coverity#1255388 Division or modulo by float zero

and

coverity#1255387 Division or modulo by float zero

Change-Id: I86c6d5874a7a2c2eecefe7f786edff89ff50ffbf

vcl/opengl/gdiimpl.cxx

@@ -727,6 +727,9 @@ void OpenGLSalGraphicsImpl::DrawTransformedTexture(
     const basegfx::B2DPoint& rX,
     const basegfx::B2DPoint& rY )
 {
+    if (!rTexture.GetWidth() || !rTexture.GetHeight())
+        return;
+
     const basegfx::B2DVector aXRel = rX - rNull;
     const basegfx::B2DVector aYRel = rY - rNull;
     const float aValues[] = {