Fix SCTP-related warnings

[mickel8]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.43%. Comparing base (61449da) to head (3c45663).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ex_webrtc/peer_connection.ex	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #210      +/-   ##
==========================================
- Coverage   88.58%   88.43%   -0.15%     
==========================================
  Files          49       49              
  Lines        2593     2595       +2     
==========================================
- Hits         2297     2295       -2     
- Misses        296      300       +4     

Files with missing lines	Coverage Δ
lib/ex_webrtc/sctp_transport.ex	83.23% <ø> (ø)
lib/ex_webrtc/peer_connection.ex	86.92% <91.66%> (+0.03%)	⬆️

... and 2 files with indirect coverage changes

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