[PATCH xserver] glamor: avoid a crash if texture allocation failed

[Eric Anholt]

Olivier Fourdan <ofourdan at redhat.com> writes:

> Texture creation in _glamor_create_tex() can fail if a GL_OUT_OF_MEMORY
> is raised, in which case the texture returned is zero.
>
> But the texture value is not checked in glamor_create_fbo() and glamor
> will abort in glamor_pixmap_ensure_fb() because the fbo->tex is 0:

Reviewed, tagged for stable, and pushed.  Thanks!
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