[PATCH] gpu: v3d: fix a missing check of pm_runtime_get_sync

[Eric Anholt]

Kangjie Lu <kjlu at umn.edu> writes:

> pm_runtime_get_sync could fail and thus deserves a check.
>
> The patch adds such a check and return its error code upstream
> if it indeed failed.

Applied the review and merged to drm-misc-next.  Thanks!
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