Now that it's always non-null when the pixmap is non-null, we don't
need so much of this. glamor_get_pixmap_private() itself still
accepts a NULL pixmap and returns NULL, because of glamor_render.c
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Keith Packard <keithp@keithp.com>