Fix #1181

[redboltz]

Fix integer overflow on msgpack_unpacker_expand_buffer(().

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.47%. Comparing base (ecc3a9b) to head (8a48af0).
⚠️ Report is 1 commits behind head on c_master.
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Additional details and impacted files

@@             Coverage Diff              @@
##           c_master    #1182      +/-   ##
============================================
+ Coverage     55.35%   57.47%   +2.11%     
============================================
  Files            10       10              
  Lines          1120     1124       +4     
  Branches        127      130       +3     
============================================
+ Hits            620      646      +26     
+ Misses          500      478      -22     

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