greybus: operation: make response helper static

Since commit 46ce118a2678 ("operation: refactor response handling")
sending operation responses is handled by greybus core so there is
currently no need to export the response helper.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/operation.c

@@ -29,6 +29,9 @@ static struct workqueue_struct *gb_operation_workqueue;
  */
 static DEFINE_SPINLOCK(gb_operations_lock);
 
+static int gb_operation_response_send(struct gb_operation *operation,
+					int errno);
+
 /*
  * Set an operation's result.
  *
@@ -649,7 +652,8 @@ EXPORT_SYMBOL_GPL(gb_operation_request_send_sync);
  * it can simply supply the result errno; this function will
  * allocate the response message if necessary.
  */
-int gb_operation_response_send(struct gb_operation *operation, int errno)
+static int gb_operation_response_send(struct gb_operation *operation,
+					int errno)
 {
 	struct gb_connection *connection = operation->connection;
 	int ret;
@@ -685,7 +689,6 @@ int gb_operation_response_send(struct gb_operation *operation, int errno)
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(gb_operation_response_send);
 
 /*
  * This function is called when a message send request has completed.

drivers/staging/greybus/operation.h

@@ -150,7 +150,6 @@ int gb_operation_request_send(struct gb_operation *operation,
 				gb_operation_callback callback,
 				gfp_t gfp);
 int gb_operation_request_send_sync(struct gb_operation *operation);
-int gb_operation_response_send(struct gb_operation *operation, int errno);
 
 void gb_operation_cancel(struct gb_operation *operation, int errno);