Fix float encoder overflow

[HTHou]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.91667% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.55%. Comparing base (a0310f8) to head (50ad190).
Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
...g/apache/tsfile/encoding/decoder/FloatDecoder.java	94.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #342      +/-   ##
===========================================
+ Coverage    64.01%   64.55%   +0.53%     
===========================================
  Files          515      538      +23     
  Lines        32488    31829     -659     
  Branches      4191     4231      +40     
===========================================
- Hits         20797    20547     -250     
+ Misses       11218    10785     -433     
- Partials       473      497      +24     

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