client: fix race condition when reading absolute time

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.08772% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 73.03%. Comparing base (c7f90fd) to head (5a11829).

Files	Patch %	Lines
client.go	70.21%	13 Missing and 1 partial ⚠️
client_track.go	65.21%	6 Missing and 2 partials ⚠️
client_track_processor_fmp4.go	79.31%	6 Missing ⚠️
client_stream_processor_mpegts.go	92.85%	2 Missing and 1 partial ⚠️
client_primary_downloader.go	92.85%	2 Missing ⚠️
client_stream_processor_fmp4.go	96.15%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
+ Coverage   72.44%   73.03%   +0.59%     
==========================================
  Files          43       44       +1     
  Lines        3858     3813      -45     
==========================================
- Hits         2795     2785      -10     
+ Misses        851      823      -28     
+ Partials      212      205       -7     

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