revlog: fix type confusion with sidedata_comp_len (
issue6580)
The format string uses "i" (int) for sidedata_comp_len, so we shouldn't
be passing a pointer to Py_ssize_t to PyArg_ParseTuple. On 64-bit
big-endian, this would result in python only writing to the upper 32
bits, and things go downhill from there.
Differential Revision: https://phab.mercurial-scm.org/D11334
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