hv: remove free_channel() from hyperv.h

This function is only used in the file it is declared in
(channel_mgmt.c) so make it static and remove it from the hyperv.h file.

Cc: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/hv/channel_mgmt.c

@@ -196,7 +196,7 @@ static void release_channel(struct work_struct *work)
 /*
  * free_channel - Release the resources used by the vmbus channel object
  */
-void free_channel(struct vmbus_channel *channel)
+static void free_channel(struct vmbus_channel *channel)
 {
 
 	/*

include/linux/hyperv.h

@@ -606,8 +606,6 @@ struct vmbus_channel {
 	void *channel_callback_context;
 };
 
-void free_channel(struct vmbus_channel *channel);
-
 void vmbus_onmessage(void *context);
 
 int vmbus_request_offers(void);