anv: if queue is NULL in vm_bind return early

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>

src/intel/vulkan/anv_sparse.c

@@ -795,11 +795,13 @@ anv_sparse_bind_vm_bind(struct anv_device *device,
 {
    struct anv_queue *queue = submit->queue;
 
-   if (!queue)
-      assert(submit->wait_count == 0 && submit->signal_count == 0);
-
    VkResult result = device->kmd_backend->vm_bind(device, submit,
                                                   ANV_VM_BIND_FLAG_NONE);
+   if (!queue) {
+      assert(submit->wait_count == 0 && submit->signal_count == 0 &&
+             submit->binds_len == 1);
+      return result;
+   }
 
    if (result == VK_ERROR_OUT_OF_HOST_MEMORY) {
       /* If we get this, the system is under memory pressure. First we