gh-141707: Fix tarfile type corruption with GNU long names #143157
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When processing GNU long name headers, the name field in the second header contains garbage data. The V7 directory detection logic in frombuf() would incorrectly mark regular files as directories if this garbage ended with '/'. Re-apply the detection after patching the actual long name to correct any type corruption.
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When processing GNU long name headers, tarfile reads the actual name from data blocks but the second header's name field contains garbage. The V7 directory detection in frombuf() could incorrectly mark regular files as directories if this garbage ended with '/'.
This fix re-applies the V7 directory detection after patching the actual long name, correcting any type corruption caused by the garbage name data.
Fixes #141707