ZdcRec: Fix cppcheck warning.

Fix cppcheck warning + small cleanup.

This merge request affects 1 package:

• ForwardDetectors/ZDC/ZdcRec

This merge request affects 3 files:

• ForwardDetectors/ZDC/ZdcRec/ZdcRec/ZdcRecChannelTool.h
• ForwardDetectors/ZDC/ZdcRec/src/ZdcRec.cxx
• ForwardDetectors/ZDC/ZdcRec/src/ZdcRecChannelTool.cxx

added ForwardDetectors master review-pending-level-1 labels

CI Result SUCCESS (hash 34868893)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: 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
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 30164]

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

merged

mentioned in commit 95ec7d2a

added sweep:ignore label