delta-find: clarify some comment and code in is_good_delta_info
We move the comment closer to the code it describ and we compute an
intermediate value without using the `textlen` variable, as it will stop being
defined in a future patch.
This will clarify future patches.
@echo off
powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"