drm/xe/display: Add check for alloc_ordered_workqueue()

Add check for the return value of alloc_ordered_workqueue()
in xe_display_create() to catch potential exception.

Fixes: 44e6949 ("drm/xe/display: Implement display support")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://lore.kernel.org/r/4ee1b0e5d1626ce1dde2e82af05c2edaed50c3aa.1747397638.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit 5b62d63)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

Author: Haoxiang Li

drivers/gpu/drm/xe/display/xe_display.c

@@ -104,6 +104,8 @@ int xe_display_create(struct xe_device *xe)
 	spin_lock_init(&xe->display.fb_tracking.lock);
 
 	xe->display.hotplug.dp_wq = alloc_ordered_workqueue("xe-dp", 0);
+	if (!xe->display.hotplug.dp_wq)
+		return -ENOMEM;
 
 	return drmm_add_action_or_reset(&xe->drm, display_destroy, NULL);
 }