preallocate the message buffers of the ipv4.Message passed to ReadBatch

[marten-seemann]

Part of #3526

[codecov]

Codecov Report

Base: 85.55% // Head: 85.56% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (9487742) compared to base (7023b52).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3541   +/-   ##
=======================================
  Coverage   85.55%   85.56%           
=======================================
  Files         137      137           
  Lines       10086    10088    +2     
=======================================
+ Hits         8629     8631    +2     
  Misses       1080     1080           
  Partials      377      377           

Impacted Files	Coverage Δ
sys_conn_oob.go	72.31% <100.00%> (+0.43%)	⬆️

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