examples/bencryption_bench.c: silence a bad warning from clang
examples/bencryption_bench.c: silence a bad warning from clang

DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn