[PATCH] drm/mediatek: Initialize pointer before use to avoid undefiend behaviour

[Markus Elfring]

> Initialize the pointer with NULL as mtk_drm_of_get_ddp_ep_cid
> function might return before assigning value to next pointer
> but yet further dereference to next can lead to some undefined
> behavior as it may point to some invalid location.

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…
> ---
> Coverity Message:
> CID 1601557: (#1 of 1): Uninitialized pointer read (UNINIT)
> 3. uninit_use: Using uninitialized value next.

May such information become a part for the final change description?

Regards,
Markus