Cleanup the pipeline after sending a chunked file

[violetagg]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (0.7.x@fae7905). Click here to learn what that means.
The diff coverage is 75%.

@@           Coverage Diff            @@
##             0.7.x     #468   +/-   ##
========================================
  Coverage         ?   68.94%           
  Complexity       ?     1076           
========================================
  Files            ?       73           
  Lines            ?     4544           
  Branches         ?      659           
========================================
  Hits             ?     3133           
  Misses           ?     1029           
  Partials         ?      382

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/reactor/ipc/netty/NettyOutbound.java	80% <75%> (ø)	29 <0> (?)

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