return an error in case the random number generator fails

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #2120 (e414717) into main (dfc8e1f) will decrease coverage by 0.15%.
The diff coverage is 18.18%.

@@            Coverage Diff             @@
##             main    #2120      +/-   ##
==========================================
- Coverage   62.61%   62.46%   -0.15%     
==========================================
  Files         110      110              
  Lines       11402    11445      +43     
==========================================
+ Hits         7139     7149      +10     
- Misses       3752     3781      +29     
- Partials      511      515       +4     

Files Changed	Coverage Δ
internal/core/webrtc_manager.go	62.23% <7.50%> (-4.96%)	⬇️
internal/rtmp/handshake/c1s1.go	90.10% <25.00%> (-3.08%)	⬇️
internal/core/webrtc_http_server.go	60.78% <33.33%> (-1.38%)	⬇️
internal/core/webrtc_session.go	70.60% <40.00%> (-0.80%)	⬇️

... and 3 files with indirect coverage changes

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