[patch] drm/vc4: checking for NULL instead of IS_ERR

[Eric Anholt]

Dan Carpenter <dan.carpenter at oracle.com> writes:

> vc4_plane_init() returns an ERR_PTR on error, it doesn't return NULL.
> This was obviously intended because the next lines call
> PTR_ERR(primary_plane) already.
>
> Fixes: c8b75bca92cb ('Eric Anholt <eric at anholt.net>')
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

Pulled this patch, should get it into 4.4.  Thanks!
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