redis: delete right size attribute

[miminar]

No description provided.

[codecov]

Codecov Report

Merging #2549 into master will decrease coverage by 9.67%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2549      +/-   ##
==========================================
- Coverage   60.83%   51.16%   -9.68%     
==========================================
  Files         129      129              
  Lines       11864    11864              
==========================================
- Hits         7218     6070    -1148     
- Misses       3743     5031    +1288     
+ Partials      903      763     -140

Impacted Files	Coverage Δ
registry/storage/cache/redis/redis.go	0% <0%> (ø)	⬆️
registry/storage/driver/gcs/gcs.go	0.39% <0%> (-68.67%)	⬇️
registry/storage/driver/oss/oss.go	0.56% <0%> (-56.91%)	⬇️
registry/storage/driver/s3-goamz/s3.go	0.5% <0%> (-51.14%)	⬇️
registry/storage/driver/s3-aws/s3.go	4.15% <0%> (-50.98%)	⬇️
registry/client/transport/transport.go	69.69% <0%> (-9.1%)	⬇️

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[dmcgowan]

LGTM

@stevvooe I see a comment in this file related to size -> length, can you take a look at this one as well

[stevvooe]

LGTM