undo changes to file in zip archive
Changes to the file at position index are reverted.
Upon successful completion 0 is returned. Otherwise, -1 is returned and the
error code in archive is set to indicate the error.
zip_unchange() fails if:
- Unchanging the name would result in a duplicate name in the archive.
- index is not a valid file index in
zip_unchange() was added in libzip 0.6. In libzip 0.10
the type of index was changed from
int to zip_uint64_t.