drm/exynos: Clear drvdata after component unbind
When components are unbound, DRM driver is unregistered and freed, so clear drvdata to avoid potential use-after-free issue in suspend/resume paths. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com>
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