Fix: ineffassign

[AlexStocks]

What this PR does:
to delete ineffassign error.

[codecov-io]

Codecov Report

Merging #127 into master will increase coverage by 0.07%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   67.64%   67.72%   +0.07%     
==========================================
  Files          69       69              
  Lines        4349     4347       -2     
==========================================
+ Hits         2942     2944       +2     
+ Misses       1106     1102       -4     
  Partials      301      301

Impacted Files	Coverage Δ
registry/zookeeper/registry.go	63.4% <ø> (-0.31%)	⬇️
config_center/zookeeper/impl.go	40.42% <50%> (ø)	⬆️
remoting/zookeeper/listener.go	48.64% <0%> (+1.62%)	⬆️
config_center/zookeeper/listener.go	86.95% <0%> (+4.34%)	⬆️

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