[Fix] Fix bugs when out_channels==1

[likyoo]

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.08 ⚠️

Comparison is base (892f9e1) 83.66% compared to head (f5d8f9f) 83.59%.

❗ Current head f5d8f9f differs from pull request most recent head 8091d4c. Consider uploading reports for the commit 8091d4c to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2911      +/-   ##
===========================================
- Coverage    83.66%   83.59%   -0.08%     
===========================================
  Files          156      156              
  Lines         9355     9356       +1     
  Branches      1373     1373              
===========================================
- Hits          7827     7821       -6     
- Misses        1283     1293      +10     
+ Partials       245      242       -3     

Flag	Coverage Δ
unittests	83.59% <100.00%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmseg/models/segmentors/base.py	90.27% <100.00%> (+0.13%)	⬆️
mmseg/models/segmentors/encoder_decoder.py	90.08% <100.00%> (ø)

... and 1 file with indirect coverage changes

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