WorkStruct: make allyesconfig

Fix up for make allyesconfig.

Signed-Off-By: David Howells <dhowells@redhat.com>
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index f9416c3..9ca1baf 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -206,6 +206,7 @@
 	/* workqueue */
 	struct workqueue_struct *workq;
 	struct work_struct work;
+	struct hda_bus *bus;
 };
 
 /*