[core] make sure CRcvLossList::remove() will not loop infinitely

[gou4shi1]

#2192 (comment)
This PR may not cure that issue, but this loop deserve a sanity check.

[codecov-commenter]

Codecov Report

Merging #2193 (bafb171) into master (6ae42c6) will increase coverage by 0.13%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #2193      +/-   ##
==========================================
+ Coverage   65.77%   65.91%   +0.13%     
==========================================
  Files          94       94              
  Lines       19489    19492       +3     
==========================================
+ Hits        12819    12848      +29     
+ Misses       6670     6644      -26     

Impacted Files	Coverage Δ
srtcore/list.cpp	77.37% <50.00%> (+1.31%)	⬆️
srtcore/queue.cpp	79.68% <0.00%> (-1.17%)	⬇️
srtcore/core.cpp	60.64% <0.00%> (+0.66%)	⬆️
srtcore/cache.h	83.07% <0.00%> (+3.07%)	⬆️

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