cogl-auto-texture: Avoid a double-free crash

cogl-auto-texture: Avoid a double-free crash

If texture allocation fails (e.g. on an old GPU with size limit 2048)
then `cogl_texture_new_with_size` was trying to use the same CoglError
twice. The second time was after it had already been freed.

Bug reported and fix provided by Gert van de Kraats.

Origin: https://gitlab.gnome.org/GNOME/mutter/commit/d21478b0f
Bug-Ubuntu: https://launchpad.net/bugs/1790525
Applied-upstream: 3.30.3

Gbp-Pq: Name cogl-auto-texture-Avoid-a-double-free-crash.patch