avoid endless loop between body and primaryReader

[thewangzl]

avoid endless loop between body and primaryReader, when mirrorPool is used

[codecov-commenter]

Codecov Report

Merging #663 (9f77b07) into main (ce53b79) will increase coverage by 0.00%. The diff coverage is 57.14%.

@@           Coverage Diff           @@
##             main     #663   +/-   ##
=======================================
  Coverage   80.03%   80.04%           
=======================================
  Files          95       95           
  Lines       11007    11013    +6     
=======================================
+ Hits         8810     8815    +5     
+ Misses       1715     1714    -1     
- Partials      482      484    +2     

Impacted Files	Coverage Δ
pkg/filter/proxy/primarysecondaryreader.go	82.75% <57.14%> (-3.78%)	:arrow_down:
pkg/object/mqttproxy/client.go	80.54% <0.00%> (+0.90%)	:arrow_up:

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