ref: Fix some warnings.

[bgrozev]

No description provided.

[codecov]

Codecov Report

Merging #2054 (7ab74e7) into master (f5f3991) will decrease coverage by 0.04%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #2054      +/-   ##
============================================
- Coverage     42.53%   42.50%   -0.04%     
+ Complexity     1681     1678       -3     
============================================
  Files           325      325              
  Lines         17145    17139       -6     
  Branches       2253     2252       -1     
============================================
- Hits           7293     7285       -8     
- Misses         9135     9145      +10     
+ Partials        717      709       -8     

Files	Coverage Δ
...rc/main/java/org/jitsi/videobridge/Conference.java	29.18% <50.00%> (-0.95%)	⬇️
.../src/main/kotlin/org/jitsi/videobridge/Endpoint.kt	20.18% <75.00%> (-0.19%)	⬇️
...src/main/kotlin/org/jitsi/videobridge/SsrcCache.kt	43.31% <25.00%> (ø)

... and 4 files with indirect coverage changes

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