drm/gem: Correct error condition in drm_gem_objects_lookup

drm/gem: Correct error condition in drm_gem_objects_lookup

When vmemdup_array_user() fails, 'handles' is set to a negative error
code and no memory is allocated. So the call to kvfree() should not
happen. Instead just return early with the error code.

Fixes: cb77b79abf5f ("drm/gem: Use vmemdup_array_user in drm_gem_objects_lookup")
Signed-off-by: Steven Price <steven.price@arm.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Link: https://patch.msgid.link/20251124112039.117748-1-steven.price@arm.com