egl/surfaceless: tweak surfaceless_add_configs_for_visuals()
egl/surfaceless: tweak surfaceless_add_configs_for_visuals()

Analogous to previous commit.

v2: Use correct comparison in loop conditional (Eric)
    Use valid C initializer (Gurchetan)

Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>
Reviewed-by: Gurchetan Singh <99434bba058e25b6203b8ae055a4f697dad0ef64@chromium.org>
Reviewed-by: Eric Engestrom <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@engestrom.ch>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler