fix crash in edge mode.

[johzzy]

Summary

fix crash in edge mode.

Details

crash if run edge, use conf/edge.conf or this config

    cluster {
        mode remote;
        origin xxx;
    }

[codecov-commenter]

Codecov Report

Merging #2967 (6a06989) into develop (1a6d94a) will increase coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head 6a06989 differs from pull request most recent head 8281e66. Consider uploading reports for the commit 8281e66 to get more accurate results

@@           Coverage Diff            @@
##           develop    #2967   +/-   ##
========================================
  Coverage    56.10%   56.10%           
========================================
  Files          153      153           
  Lines        57561    57559    -2     
========================================
  Hits         32294    32294           
+ Misses       25267    25265    -2     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_edge.cpp | 0.00% <0.00%> (ø) | |
| trunk/src/app/srs_app_threads.cpp | 63.70% <ø> (ø) | |

'

Translated to English while maintaining the markdown structure:

'| trunk/src/app/srs_app_edge.cpp | 0.00% <0.00%> (ø) | |
| trunk/src/app/srs_app_threads.cpp | 63.70% <ø> (ø) | |

---

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

Translated to English while maintaining the markdown structure:

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

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TRANS_BY_GPT3

[winlinvip]

Please provide more background information.

1. The code fix is for a problem with a call.
2. The configuration and reproduction steps are just a normal edge configuration.
3. It is not clear what exactly happened.

TRANS_BY_GPT3