drm/exynos: call drm_vblank_put for each queued flip event

It's guaranteed that for each event on pageflip_event_list we have
called drm_vblank_get() - see exynos_drm_crtc_page_flip() - so checking
for this is redundant.

Also we need to call drm_vblank_put() for each event on the list, not
only once, otherwise we'd leak vblank references if there are multiple
events on the list.

Signed-off-by: Imre Deak <[email protected]>
Signed-off-by: Inki Dae <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>

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