fix cLen in nocgo implementation of i444Toi420

[neversi]

Description

Fix the length of buffer - cLen in i444toI420() in nocgo implementation

[neversi]

While optimizing copy of buffers in nocgo implementation, I have faced with this bug.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (30badd8) 58.83% compared to head (08b53df) 58.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #486      +/-   ##
==========================================
+ Coverage   58.83%   58.85%   +0.02%     
==========================================
  Files          62       62              
  Lines        3741     3753      +12     
==========================================
+ Hits         2201     2209       +8     
- Misses       1413     1416       +3     
- Partials      127      128       +1     

see 1 file with indirect coverage changes

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[neversi]

@edaniels could you please at this bug?

[edaniels]

Hi @neversi, can you write a test for this? Thanks!

[neversi]

@edaniels it can be reproduced by tests with CGO_ENABLED=0

Also, I have added mock scaler to be able to pass tests for nocgo implementation and fix the ratio for i422 converter.

Now all tests pass without errors

[edaniels]

LGTM