From a1c0e5fe68b437ba43b3125fbe5d8c72dca242a2 Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@mev.co.uk>
Date: Tue, 6 May 2014 13:12:14 +0100
Subject: [PATCH] staging: comedi: pass subdevice to
 comedi_buf_write_n_available()

Local function `comedi_buf_write_n_available()` currently takes a
pointer to a `struct comedi_async`.  Change it to take a pointer to a
`struct comedi_subdevice` and use the `async` member for consistency
with the other comedi buffer handling functions.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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