drm/bochs: Drop explicit drm_mode_config_cleanup

Instead rely on the automatic clean, for which we just need to check
that drm_mode_config_init succeeded. To avoid an inversion in the
cleanup we also have to move the dev_private allocation over to
drmm_kzalloc.

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)

Acked-by: Gerd Hoffmann <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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