MCTruthClassifierGen.cxx: Fix Warning

This warning arouse from !73661 (merged) and !72297 (merged)

@averbyts

This merge request affects 1 package:

• PhysicsAnalysis/MCTruthClassifier

This merge request affects 1 file:

• PhysicsAnalysis/MCTruthClassifier/Root/MCTruthClassifierGen.cxx

Adding @zmarshal as watcher

added Analysis analysis-review-required main review-pending-level-1 labels

mentioned in merge request !73708 (merged)

CI Result SUCCESS (hash 407700e2)

	Athena	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 14512] (remote access info)

merged

mentioned in commit 52c634ef

mentioned in merge request !73334 (merged)

mentioned in merge request !73643 (merged)

Looks good to me, approving.

Cheers, Philipp (L1)

added review-approved label and removed review-pending-level-1 label