vmbus: remove per channel state

The netvsc no longer needs per channel state hook to track receive buffer.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 7a6ceee..3535913 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -823,10 +823,6 @@
 	 */
 	struct vmbus_channel *primary_channel;
 	/*
-	 * Support per-channel state for use by vmbus drivers.
-	 */
-	void *per_channel_state;
-	/*
 	 * To support per-cpu lookup mapping of relid to channel,
 	 * link up channels based on their CPU affinity.
 	 */
@@ -888,16 +884,6 @@
 	c->batched_reading = state;
 }
 
-static inline void set_per_channel_state(struct vmbus_channel *c, void *s)
-{
-	c->per_channel_state = s;
-}
-
-static inline void *get_per_channel_state(struct vmbus_channel *c)
-{
-	return c->per_channel_state;
-}
-
 static inline void set_channel_pending_send_size(struct vmbus_channel *c,
 						 u32 size)
 {