Fix Clippy warning
Fix Clippy warning


Former-commit-id: d966541c4862306366f6d18dc757320fb965f491
alekseysidorov/exonum,alekseysidorov/exonum,exonum/exonum,exonum/exonum,exonum/exonum,exonum/exonum,alekseysidorov/exonum,alekseysidorov/exonum