[PATCH] drm/vc4: cleanup with list_first_entry_or_null()

[Eric Anholt]

Masahiro Yamada <yamada.masahiro at socionext.com> writes:

> The combo of list_empty() check and return list_first_entry()
> can be replaced with list_first_entry_or_null().
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

That's a nice little cleanup.  Applied to -next.  Thanks!
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