[issue4681] mmap offset should be off_t instead of ssize_t

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

I don't think fpos_t is a suitable type here. It isn't guaranteed to be
an integral type, and, on many systems, it isn't integral. So you can't
convert int to it, and you can't do arithmetic on it.

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nosy: +loewis

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