[cl-opengl-devel] [patch] check-error fix, :no-error versus :zero

[Andy Hefner]

Enums :no-error and :zero are both defined with a value of zero. As it
happens, gl:get-error returns :zero, breaking the potentially handy
utility gl:check-error (which expects :no-error), causing it to signal
even when no error occured. The following patch resolves the issue by
eliminating :no-error and the one place that uses it.
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