fix wrong size being reported in error messages

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 81.86%. Comparing base (20b6d71) to head (bc5463f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/format/rtpav1/decoder.go	0.00%	7 Missing ⚠️
pkg/format/rtph264/decoder.go	0.00%	5 Missing ⚠️
pkg/format/rtph265/decoder.go	0.00%	5 Missing ⚠️
pkg/format/rtpmpeg4video/decoder.go	0.00%	3 Missing ⚠️
pkg/format/rtpvp8/decoder.go	0.00%	3 Missing ⚠️
pkg/format/rtpvp9/decoder.go	0.00%	3 Missing ⚠️
pkg/format/rtpmpeg1video/decoder.go	0.00%	2 Missing ⚠️
pkg/format/rtpmpeg4audio/decoder_generic.go	0.00%	2 Missing ⚠️
pkg/format/rtpmpeg4audio/decoder_latm.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
- Coverage   81.98%   81.86%   -0.13%     
==========================================
  Files         121      121              
  Lines       12559    12578      +19     
==========================================
  Hits        10297    10297              
- Misses       1845     1864      +19     
  Partials      417      417              

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