delete StreamStateError annotation in stream.rs

[Thuwzq]

resolve #324

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.30%. Comparing base (b23468d) to head (8da2691).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #325      +/-   ##
===========================================
- Coverage    95.33%   95.30%   -0.03%     
===========================================
  Files           50       50              
  Lines        33603    33603              
===========================================
- Hits         32036    32026      -10     
- Misses        1567     1577      +10     

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