Fix a 'ref_channel'-related issue in espnet2/bin/enh_inference.py

[Emrys365]

Fix the issue reported in #4970.

[codecov]

Codecov Report

Merging #4972 (4e3e14e) into master (84ccae7) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #4972   +/-   ##
=======================================
  Coverage   77.09%   77.10%           
=======================================
  Files         604      604           
  Lines       53611    53613    +2     
=======================================
+ Hits        41332    41338    +6     
+ Misses      12279    12275    -4     

Flag	Coverage Δ
test_integration_espnet1	66.33% <ø> (ø)
test_integration_espnet2	47.50% <0.00%> (+0.16%)	⬆️
test_python	66.95% <0.00%> (-0.01%)	⬇️
test_utils	23.35% <ø> (ø)

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Impacted Files	Coverage Δ
espnet2/bin/enh_inference.py	91.16% <0.00%> (-0.74%)	⬇️
espnet2/train/trainer.py	77.33% <0.00%> (+0.93%)	⬆️
espnet2/train/gan_trainer.py	69.58% <0.00%> (+1.03%)	⬆️

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[sw005320]

Thanks for the quick fix!