ByteStreamCnvSvc: Fix clang warning.

clang warning: Missing override keyword.

This merge request affects 1 package:

• Event/ByteStreamCnvSvc

added EDM master review-pending-level-1 labels

CI Result FAILURE

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-21902-2019-03-14-12-56
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 2
For experts only: Jenkins output [CI-MERGE-REQUEST 35400]

Known issue; unrelated to this MR.

Fine, aproving.

Pavol [as L2 MR shifter]

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

mentioned in commit 1139866d

merged

added sweep:ignore label