client: fix race condition when getting NTP

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.09%. Comparing base (4362616) to head (d97435d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
client_time_conv_fmp4.go	83.33%	2 Missing ⚠️
client_time_conv_mpegts.go	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #207      +/-   ##
==========================================
+ Coverage   74.03%   74.09%   +0.05%     
==========================================
  Files          58       58              
  Lines        4156     4180      +24     
==========================================
+ Hits         3077     3097      +20     
- Misses        879      883       +4     
  Partials      200      200              

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