Fix conn_param leaking issue which discovered by wangha

[JaylinYu]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 34.14% and project coverage change: -0.01 ⚠️

Comparison is base (2d4479f) 53.19% compared to head (ffa7a8e) 53.18%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #553      +/-   ##
==========================================
- Coverage   53.19%   53.18%   -0.01%     
==========================================
  Files         120      120              
  Lines       36594    36620      +26     
==========================================
+ Hits        19465    19478      +13     
- Misses      17129    17142      +13     

Impacted Files	Coverage Δ
src/mqtt/protocol/mqtt/mqttv5_client.c	0.00% <0.00%> (ø)
src/supplemental/mqtt/mqtt_msg.c	47.45% <22.22%> (-0.48%)	⬇️
src/sp/protocol/mqtt/nmq_mqtt.c	45.80% <55.55%> (+0.76%)	⬆️
src/mqtt/protocol/mqtt/mqtt_client.c	66.52% <58.33%> (+0.65%)	⬆️

... and 20 files with indirect coverage changes

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