Elm: minor changes

[masatake]

No description provided.

[codecov]

Codecov Report

Merging #3320 (f4dfe9f) into master (94e964e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3320   +/-   ##
=======================================
  Coverage   85.41%   85.42%           
=======================================
  Files         216      216           
  Lines       50278    50282    +4     
=======================================
+ Hits        42947    42951    +4     
  Misses       7331     7331           

Impacted Files	Coverage Δ
peg/elm_post.h	100.00% <100.00%> (ø)

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[masatake]

I'm not sure whether using access: field for storing the information about ports is good or not.
I'll keep this as a draft pull request.