staging: comedi: avoid bad truncation of a size_t in comedi_read()
At one point in `comedi_read()`, the variable `n` gets assigned to the minimum of the parameter `nbytes` and the amount of readable buffer space `m`. The way that is done currently is unsafe in the unlikely case that `nbytes` exceeds `UINT_MAX`, so fix it. Signed-off-by: NIan Abbott <abbotti@mev.co.uk> Reviewed-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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