FIx bugs in mqtt_codec module by alvin

[JaylinYu]

No description provided.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.04 🎉

Comparison is base (896665f) 59.23% compared to head (ffa9a90) 59.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   59.23%   59.27%   +0.04%     
==========================================
  Files          96       96              
  Lines       26428    26442      +14     
==========================================
+ Hits        15654    15673      +19     
+ Misses      10774    10769       -5     

Impacted Files	Coverage Δ
src/mqtt/protocol/mqtt/mqtt_client.c	0.00% <0.00%> (ø)
src/mqtt/protocol/mqtt/mqttv5_client.c	0.00% <0.00%> (ø)
src/supplemental/mqtt/mqtt_codec.c	41.71% <0.00%> (-0.15%)	⬇️

... and 13 files with indirect coverage changes

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