Fixes memory leak in cbor_bytestring_add_chunk

[James-ZHANG]

PR: Fixes memory leak in cbor_bytestring_add_chunk

Description

The passed chunk is not freed when cbor_bytestring_add_chunk returns false.

Checklist

• I have read followed CONTRIBUTING.md
  • I have added tests
  • I have updated the documentation
  • I have updated the CHANGELOG
• Are there any breaking changes? If so, are they documented?
  No
• Does this PR introduce any platform specific code? If so, is this captured in the description?
  No
• Security: Does this PR potentially affect security? If so, is this captured in the description?
  No
• Performance: Does this PR potentially affect performance? If so, is this captured in the description?
  No

[codecov-commenter]

Codecov Report

Merging #228 (8cf378c) into master (f8c9891) will decrease coverage by 0.31%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #228      +/-   ##
==========================================
- Coverage   95.96%   95.65%   -0.32%     
==========================================
  Files          20       20              
  Lines        1538     1543       +5     
==========================================
  Hits         1476     1476              
- Misses         62       67       +5     

Impacted Files	Coverage Δ
src/cbor/bytestrings.c	94.64% <50.00%> (-3.44%)	⬇️
src/cbor/internal/builder_callbacks.c	89.28% <50.00%> (-0.41%)	⬇️
src/cbor/streaming.c	98.01% <0.00%> (-1.00%)	⬇️

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[PJK]

Nice catch, thanks!

Also filed #231 to improve test coverage