drm/repaper: Drop explicit drm_mode_config_cleanup call

Allows us to drop the drm_driver.release callback.

This is made possible by a preceeding patch which added a drmm_
cleanup action to drm_mode_config_init(), hence all we need to do to
ensure that drm_mode_config_cleanup() is run on final drm_device
cleanup is check the new error code for _init().

v2: Explain why this cleanup is possible (Laurent).

v3: Use drmm_mode_config_init() for more clarity (Sam, Thomas)
I also noticed that I've failed to add the error checking,
__must_check caught that.

Cc: Sam Ravnborg <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Reviewed-by: Noralf Trønnes <[email protected]> (v2)
Signed-off-by: Daniel Vetter <[email protected]>
Cc: "Noralf Trønnes" <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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