In the error handling path we end up creating a vk_sync and then later
we vk_sync_wait() on it. If that wait fails somehow we'll end up calling
vk_queue_set_lost(&queue->vk, ...) which would segfault if queue is
NULL.
If we end up in this situation (no queue), return directly whatever the
backend's vm_bind function returned, propagating the error up if
necessary.
Fixes: dd5362c78a ("anv/xe: try harder when the vm_bind ioctl fails")
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31048>
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