remove unintended shadowing assignment

[Songmu]

No description provided.

[codecov]

Codecov Report

Merging #60 (0e4880b) into main (cf38712) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #60   +/-   ##
=======================================
  Coverage   74.09%   74.09%           
=======================================
  Files          11       11           
  Lines         938      938           
=======================================
  Hits          695      695           
  Misses        174      174           
  Partials       69       69           

Impacted Files	Coverage Δ
conn.go	69.51% <100.00%> (ø)

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[coveralls]

Coverage remained the same at 78.571% when pulling 0e4880b on Songmu:fix-stmt-assignment into cf38712 on shogo82148:main.

[shogo82148]