Remove unused function

[IamBusy]

I think it's a good habitat to keep code clean. So I removed the unused function hasCode.

Signed-off-by: william wei [email protected]

[codecov]

Codecov Report

Merging #2275 into master will decrease coverage by 10.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2275       +/-   ##
===========================================
- Coverage   61.59%   51.51%   -10.08%     
===========================================
  Files         125      125               
  Lines       11405    11402        -3     
===========================================
- Hits         7025     5874     -1151     
- Misses       3495     4782     +1287     
+ Partials      885      746      -139

Impacted Files	Coverage Δ
registry/storage/driver/s3-goamz/s3.go	0.5% <ø> (-50.88%)	⬇️
registry/storage/driver/gcs/gcs.go	0.4% <0%> (-68.94%)	⬇️
registry/storage/driver/oss/oss.go	0.56% <0%> (-57.23%)	⬇️
registry/storage/driver/s3-aws/s3.go	4.57% <0%> (-56.23%)	⬇️
registry/client/transport/transport.go	69.69% <0%> (-13.64%)	⬇️

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[dmcgowan]

LGTM