compiler/glsl: avoid null-pointer deref

When we encounter a bindless image here, lower_deref returns a NULL-pointer, and calling record_images_used will try to dereference that NULL-pointer.

So let's dig out the var from the source instruction instead of the result of the lowering.

Fixes: 5910c938 ("nir/glsl: gather bitmask of images used by program")

I noticed this from a coverity report, I don't have an example of a crash. But in either case, this looks like the right fix to me.

added GLSL label

added NIR label

Yes this LGTM, Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

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• ef861bed - compiler/glsl: avoid null-pointer deref

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assigned to @marge-bot and unassigned @tpalli

mentioned in commit kusma/mesa@e0e1c364

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• ef861bed...d03a9fa5 - 49 commits from branch mesa:master
• e0e1c364 - compiler/glsl: avoid null-pointer deref

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assigned to @kusma and unassigned @marge-bot

I couldn't merge this branch: CI failed!

assigned to @marge-bot and unassigned @kusma

mentioned in commit kusma/mesa@89a04a54

added 20 commits

• e0e1c364...cb580af0 - 19 commits from branch mesa:master
• 89a04a54 - compiler/glsl: avoid null-pointer deref

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merged

mentioned in commit d30cea2b