[GCC11] Fix warning: 'result' is used uninitialized

[iarspider]

Log file: https://cmssdt.cern.ch/SDT/cgi-bin/buildlogs/slc7_amd64_gcc11/CMSSW_12_1_X_2021-08-24-0900/SimDataFormats/DigiSimLinks

.../src/SimDataFormats/DigiSimLinks/src/DTDigiSimLink.cc: In member function 'DTDigiSimLink::ChannelType DTDigiSimLink::channel() const':
  .../src/SimDataFormats/DigiSimLinks/src/DTDigiSimLink.cc:29:11: warning: 'result' is used uninitialized [-Wuninitialized]
    29 |   return *p_result;
      |           ^~~~~~~~
.../src/SimDataFormats/DigiSimLinks/src/DTDigiSimLink.cc:25:18: note: 'result' declared here
   25 |   ChannelPacking result;
      |                  ^~~~~~

[iarspider]

please test for slc7_amd64_gcc11

[cmsbuild]

-code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-35040/24901

• This PR adds an extra 12KB to repository

Code check has found code style and quality issues which could be resolved by applying following patch(s)

• code-format:
  https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-35040/24901/code-format.patch
  e.g. curl https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-35040/24901/code-format.patch | patch -p1
  You can also run scram build code-format to apply code format directly

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-35040/24902

• This PR adds an extra 12KB to repository

[cmsbuild]

A new Pull Request was created by @iarspider for master.

It involves the following packages:

• SimDataFormats/DigiSimLinks (simulation)

@cmsbuild, @civanch, @mdhildreth can you please review it and eventually sign? Thanks.
@sscruz, @fabiocos, @Fedespring, @battibass, @trocino, @apsallid, @abbiendi, @JanFSchulte, @jhgoh, @VinInn, @bsunanda, @HuguesBrun, @rovere, @lecriste, @calderona, @mmusich, @mtosi, @ebrondol, @cericeci this is something you requested to watch as well.
@perrotta, @dpiparo, @qliphy you are the release manager for this.

cms-bot commands are listed here

[iarspider]

please test for slc7_amd64_gcc11

[cmsbuild]

-1

Failed Tests: Build
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-c49580/18078/summary.html
COMMIT: f7aecef
CMSSW: CMSSW_12_1_X_2021-08-25-1100/slc7_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/35040/18078/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @bsunanda Run3-gex90 Make unique material names as default for all Run3 scenarios #34983
• @bsunanda Run3-alca198 Modify the analyzers to record muons not on event basis but on single muon basis #34980
• @missirol Fixing some edge cases in HLT-Patatrack customisations #34992
• @dildick New option in CSC DigiToRaw to pack strip digis by CFEB in each chamber.  #34783
• @Dr15Jones Use sufficient digits when converting a double #34999

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-c49580/18078/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-c49580/18078/git-merge-result

Build

I found compilation warning when building: See details on the summary page.

[iarspider]

As far as I can tell, it's a false-positive.