egl/dri2: Properly dereference array.
egl/dri2: Properly dereference array.

Fixes a regression that broke EGL since

commit 858f2f2ae6d72f338fdd6d544b0c733814e22724
Author: Emil Velikov <emil.l.velikov@gmail.com>
Date:   Sun Sep 13 12:25:27 2015 +0100

    egl/dri2: ease srgb __DRIconfig conditionals

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler