[PATCH] mtd: blktrans: use better error code for unimplemented ioctl()

[Brian Norris]

On Thu, May 21, 2015 at 10:54:31AM -0700, Brian Norris wrote:
> In commit 50183936254b ("mtd: blktrans: change blktrans_getgeo return
> value") we fixed the problem that ioctl(HDIO_GETGEO) might return 0
> (success) for mtdblock devices which did not implement the feature and
> would leave a blank (zero) result.
> 
> But now, let's get the error code right. Other code paths on this ioctl
> tend to use -ENOTTY to notify the user that the ioctl() is not supported
> for the device, so let's use that instead of -EOPNOTSUPP.
> 
> Suggested-by: Richard Weinberger <richard at nod.at>
> Signed-off-by: Brian Norris <computersforpeace at gmail.com>
> ---
> Against l2-mtd.git (linux-next)

Applied.