Remove warning

[mfornet]

Remove cargo complain about unused variable.

[codecov]

Codecov Report

Merging #1935 into staging will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           staging    #1935      +/-   ##
===========================================
+ Coverage    86.71%   86.75%   +0.03%     
===========================================
  Files          167      167              
  Lines        31690    31676      -14     
===========================================
  Hits         27479    27479              
+ Misses        4211     4197      -14

Impacted Files	Coverage Δ
runtime/runtime/src/balance_checker.rs	97.06% <ø> (+0.33%)	⬆️
chain/jsonrpc/src/metrics.rs	50% <0%> (-16.67%)	⬇️
runtime/runtime/src/metrics.rs	83.33% <0%> (-7.58%)	⬇️
chain/client/src/sync.rs	87.89% <0%> (-0.65%)	⬇️
chain/network/src/peer.rs	74.8% <0%> (-0.2%)	⬇️
core/store/src/trie/mod.rs	90.01% <0%> (-0.15%)	⬇️
near/tests/rpc_nodes.rs	95.06% <0%> (-0.12%)	⬇️
chain/jsonrpc/tests/rpc_query.rs	98.14% <0%> (-0.07%)	⬇️
chain/epoch_manager/src/lib.rs	96.71% <0%> (-0.04%)	⬇️
chain/chain/tests/finality.rs	98.21% <0%> (-0.01%)	⬇️
... and 22 more

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