[PATCH] mtd: use correct format specifier

[Jean-Christophe PLAGNIOL-VILLARD]

On 10:31 Fri 07 Sep     , Jan Luebbe wrote:
> For the size_t type the format specifier %zu or %zx must be used.
> See Documentation/printk-formats.txt in the kernel for details.
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>

can you fix 

/opt/work/barebox/drivers/mtd/mtdraw.c: In function 'mtdraw_read':
/opt/work/barebox/drivers/mtd/mtdraw.c:140:3: warning: format '%lu' expects
type 'long unsigned int', but argument 2 has type 'ssize_t'

too

Best Regards,
J.