[PATCH] drm/vc4: mark vc4_bo_cache_purge() static

[Eric Anholt]

Baoyou Xie <baoyou.xie at linaro.org> writes:

> We get 1 warning when building kernel with W=1:
> drivers/gpu/drm/vc4/vc4_bo.c:147:6: warning: no previous prototype for 'vc4_bo_cache_purge' [-Wmissing-prototypes]
>
> In fact, this function is only used in the file in which it is
> declared and don't need a declaration, but can be made static.
> So this patch marks it 'static'.
>
> Signed-off-by: Baoyou Xie <baoyou.xie at linaro.org>

Applied to -fixes.  Thanks!
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