libsrtp2: fix compilation with GCC 10

[HungMingWu]

Please refer the issue on the link openwrt/telephony#546

[codecov-commenter]

Codecov Report

Merging #2397 (8c76fbd) into 4.0release (d526672) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           4.0release    #2397      +/-   ##
==============================================
- Coverage       38.73%   38.72%   -0.01%     
==============================================
  Files             109      109              
  Lines           39658    39658              
==============================================
- Hits            15360    15359       -1     
- Misses          24298    24299       +1     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/protocol/srs_service_utility.cpp | 72.43% <0.00%> (-0.55%) | ⬇️ |

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TRANS_BY_GPT3

[winlinvip]

Thank you for your contribution. 👍

It seems like this is an issue with the SRTP code. Can we consider submitting a PR to SRTP as well?

TRANS_BY_GPT3

[HungMingWu]

I don't know where the repo for srtp is.. libsrtp doesn't seem like it.

TRANS_BY_GPT3

[winlinvip]

Merged as cc99226

👍 Thanks a lot @HungMingWu