WorkStruct: make allyesconfig

Fix up for make allyesconfig.

Signed-Off-By: David Howells <dhowells@redhat.com>
diff --git a/include/linux/relay.h b/include/linux/relay.h
index 24accb4..0e3d91b 100644
--- a/include/linux/relay.h
+++ b/include/linux/relay.h
@@ -38,7 +38,7 @@
 	size_t subbufs_consumed;	/* count of sub-buffers consumed */
 	struct rchan *chan;		/* associated channel */
 	wait_queue_head_t read_wait;	/* reader wait queue */
-	struct work_struct wake_readers; /* reader wake-up work struct */
+	struct delayed_work wake_readers; /* reader wake-up work struct */
 	struct dentry *dentry;		/* channel file dentry */
 	struct kref kref;		/* channel buffer refcount */
 	struct page **page_array;	/* array of current buffer pages */