drm: rcar-du: Don't initialize event->pipe field
drm: rcar-du: Don't initialize event->pipe field

The field is set by drm_send_vblank_event(), there's no need to
preinitialize it.

Signed-off-by: Laurent Pinchart <ae960578cc5eca7b9b1dbc37d9caa6cb634f35e0@ideasonboard.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs