RpcOverlay+TgcOverlay: Fix cppcheck warnings.

Ignored function return values.

This merge request affects 2 packages:

• MuonSpectrometer/MuonOverlay/RpcOverlay
• MuonSpectrometer/MuonOverlay/TgcOverlay

Affected files list will not be printed in this case

Adding @jchapman ,@rosati ,@stavrop ,@kluit ,@jojungge ,@ahaas ,@tkharlam ,@apsallid ,@pscholer ,@tadej as watchers

added MuonSpectrometer Overlay main review-pending-level-1 labels

The system selected 8 tests to probe the Athena changeset (out of 64 available tests). Link to tests selection rules

CI Result SUCCESS (hash 9948e1d4)

	Athena
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 79202]

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit 41e661fd

added sweep:ignore label