76x: do not use unsigned in algebra

[mmusich]

Backport of #14698

[mmusich]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/13290/console

[cmsbuild]

A new Pull Request was created by @mmusich (Marco Musich) for CMSSW_7_6_X.

It involves the following packages:

CalibCalorimetry/EcalLaserCorrection

@ghellwig, @cerminar, @cmsbuild, @franzoni, @mmusich, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @tocheng, @argiro this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[cmsbuild]

+1
Tested at: 78b8388
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-14710/13290/summary.html

[mmusich]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_6_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-14710/13290/summary.html

[davidlange6]

+1