fix some crash in rtc.

[johzzy]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2545 (d9685a5) into develop (a830289) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #2545      +/-   ##
===========================================
- Coverage    59.24%   59.23%   -0.01%     
===========================================
  Files          122      122              
  Lines        51741    51749       +8     
===========================================
  Hits         30653    30653              
- Misses       21088    21096       +8     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_rtc_source.cpp | 12.37% <0.00%> (-0.02%) | ⬇️ |
| trunk/src/kernel/srs_kernel_rtc_rtcp.cpp | 5.23% <0.00%> (-0.05%) | ⬇️ |

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Translated to English while maintaining the markdown structure:

'> Δ = absolute <relative> (impact), ø = not affected, ? = missing data

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