drm/vgem: Ditch attach trickery in the fence ioctl

It looks like this was done purely to get a consistent place to look
up the reservation object pointer. With the drm_prime.c helper code
now also setting gem_object->resv for imported objects we can just use
that pointer directly, instead of first ensuring a dma-buf exists.

v2: Note that I screwed up the patch ordering, hence why this needed
a Fixes: tag - CI spotted the broken intermediate state.

Fixes: 5eab998741c8 ("drm/vgem: Drop drm_gem_prime_export")
Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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