Fix requeue logic in processor

[hibiken]

Closes #90

[codecov]

Codecov Report

Merging #170 into master will decrease coverage by 0.06%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
- Coverage   84.09%   84.03%   -0.07%     
==========================================
  Files          16       16              
  Lines        1610     1597      -13     
==========================================
- Hits         1354     1342      -12     
+ Misses        173      172       -1     
  Partials       83       83              

Impacted Files	Coverage Δ
internal/base/base.go	91.93% <ø> (ø)
internal/rdb/rdb.go	74.39% <ø> (+1.13%)	⬆️
processor.go	90.47% <66.66%> (-0.77%)	⬇️
syncer.go	93.33% <0.00%> (-6.67%)	⬇️

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