WorkStruct: make allyesconfig

Fix up for make allyesconfig.

Signed-Off-By: David Howells <dhowells@redhat.com>
diff --git a/include/linux/i2o.h b/include/linux/i2o.h
index c115e9e..1fb02e1 100644
--- a/include/linux/i2o.h
+++ b/include/linux/i2o.h
@@ -461,7 +461,7 @@
 	int (*reply) (struct i2o_controller *, u32, struct i2o_message *);
 
 	/* Event handler */
-	void (*event) (struct i2o_event *);
+	work_func_t event;
 
 	struct workqueue_struct *event_queue;	/* Event queue */