we only use 8 array entries

Change-Id: Ie85fa48906e1e6b8c19e2daba65517ea923be457
Reviewed-on: https://gerrit.libreoffice.org/18071Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

vcl/opengl/gdiimpl.cxx

@@ -1265,7 +1265,7 @@ void OpenGLSalGraphicsImpl::drawRect( long nX, long nY, long nWidth, long nHeigh
         GLfloat fX2(nX + nWidth - 1);
         GLfloat fY2(nY + nHeight - 1);
 
-        GLfloat pPoints[16];
+        GLfloat pPoints[8];
 
         pPoints[0] = fX1;
         pPoints[1] = fY1;