[erlang-patches] Fix to mod_log logging of content length

[Garrett Smith]

git fetch git://github.com/gar1t/otp.git mod_log-fix

https://github.com/gar1t/otp/compare/mod_log-fix
https://github.com/gar1t/otp/compare/mod_log-fix.patch

mod_log was logging response content length as a string, which was
formatted in the log as an Erlang integer list.

It uses integer for Bytes transferred everywhere else.

This fix converts content length from a string to an integer, which
corrects the log formatting problem.