[Bug 97321] Query INFO_LOG_LENGTH for empty info log should return 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97321

--- Comment #2 from Qiankun Miao <qiankun.miao at intel.com> ---
(In reply to Tapani Pälli from comment #1)
> Qiankun: is there some test case that hits this?

I met this issue when I running a WebGL conformance test:
https://www.khronos.org/registry/webgl/sdk/tests/conformance/programs/program-infolog.html?webglVersion=1.
Now, I workarounded the bug in chrome, but the bug in mesa is still existed. 

To reproduce the bug:
(1) you can download a stable chrome. Note: canary chrome cannot reproduce the
bug.
(2) run chrome --enable-unsafe-es3-apis --ignore-gpu-blacklist
https://www.khronos.org/registry/webgl/sdk/tests/conformance/programs/program-infolog.html?webglVersion=1.
(3) All tests should pass.

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