mesa: Prevent classic swrast crash on a surfaceless context v2.

This fixes the egl_mesa_platform_surfaceless piglit test as well
as the new egl_ext_device_base piglit test on classic swrast.

v2: Fix swrast surfaceless contexts on the driver side.

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Mathias Fröhlich <Mathias.Froehlich@web.de>
1 file changed