glsl-max-varyings: Clean up max_varyings misnomer.
In glsl-max-varyings' draw() function, the parameter max_varyings actually represented the number of varyings to test, not the maximum. Renamed to num_varyings, in accordance with the name of this parameter in get_vs() and get_fs(). Reviewed-by: Eric Anholt <firstname.lastname@example.org>
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