[issue39688] tarfile: GNU sparse 1.0 pax tar header offset not properly computed

[Valentin Samir]

Valentin Samir <valentin.samir at crans.org> added the comment:

hum trying to be clever and I am doing mistakes.

This commit is simpler and effectively fixes the issue https://github.com/nitmir/cpython/commit/682138a3544a2d7de457c88712e738938568f908

tarinfo.offset_data is where tarfile start reading the file data and thus must be set to the beginning of the actual data for a sparse file even if the data block starts before.

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