[PATCH V2 2/3] scsi: fix compiler warning for sg

[Timur Tabi]

Sinan Kaya wrote:
>
> The code says it is using these macros for small integers only which
> can't overflow. I was trying to get rid of compiler warning and it seems
> to have disappeared.

I would double-check the assembly code, if I were you.  I don't like it 
when warnings just go away like that.

Besides, we *should* be using do_div() for 64-bit division.

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