drm/xe: Check return value of GGTT workqueue allocation

Workqueue allocation can fail, so check the return value of the GGTT
workqueue allocation and fail driver initialization if the allocation
fails.

Fixes: dd08ebf ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Cc: [email protected]
Signed-off-by: Matthew Brost <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
(cherry picked from commit 1f1314e8e71385bae319e43082b798c11f6648bc)
Signed-off-by: Lucas De Marchi <[email protected]>

Author: mbrost05

drivers/gpu/drm/xe/xe_ggtt.c

@@ -292,6 +292,9 @@ int xe_ggtt_init_early(struct xe_ggtt *ggtt)
 		ggtt->pt_ops = &xelp_pt_ops;
 
 	ggtt->wq = alloc_workqueue("xe-ggtt-wq", 0, WQ_MEM_RECLAIM);
+	if (!ggtt->wq)
+		return -ENOMEM;
+
 	__xe_ggtt_init_early(ggtt, xe_wopcm_size(xe));
 
 	err = drmm_add_action_or_reset(&xe->drm, ggtt_fini_early, ggtt);