clang-tidy: add const to parameter

[neheb]

Signed-off-by: Rosen Penev [email protected]

[ghost]

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Legend

[codecov]

Codecov Report

Merging #2483 (4f9d591) into main (a7a9835) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main    #2483   +/-   ##
=======================================
  Coverage   62.11%   62.11%           
=======================================
  Files         121      121           
  Lines       22820    22820           
  Branches    11209    11209           
=======================================
  Hits        14174    14174           
  Misses       6439     6439           
  Partials     2207     2207           

Impacted Files	Coverage Δ
src/asfvideo.cpp	4.01% <50.00%> (ø)

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