disk: Rename block_dev to desc

The use of 'block_dev' in this context is confusing, since it is not a
pointer to a device, just to some information about it. Rename this to
'desc', as is more commonly used, since it is a block descriptor.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heinrich Schuchardt <xypron.glplk@gmx.de>
1 file changed