[PATCH libdrm] Mark functions printf-like where possible

[Eric Anholt]

Thierry Reding <thierry.reding at gmail.com> writes:

> From: Thierry Reding <treding at nvidia.com>
>
> These functions all take a format string and either a list of variable
> arguments or a va_list. Use the new DRM_PRINTFLIKE macro to tell the
> compiler about it so that the arguments can be checked against the
> format string.

Reviewed-by: Eric Anholt <eric at anholt.net>
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