Fix logic error in check_integrity

[pmeier]

See #869

[fmassa]

Thanks!

I have some minor stylistic comments.

Also, can you add some tests in test_datasets.py for both check_integrity and check_md5?

[pmeier]

Also, can you add some tests in test_datasets.py for both check_integrity and check_md5?

Sure. Should I push them to this branch or open another PR?

[codecov-io]

Codecov Report

Merging #871 into master will decrease coverage by 0.07%.
The diff coverage is 18.18%.

@@            Coverage Diff             @@
##           master     #871      +/-   ##
==========================================
- Coverage   54.51%   54.44%   -0.08%     
==========================================
  Files          36       36              
  Lines        3320     3328       +8     
  Branches      546      548       +2     
==========================================
+ Hits         1810     1812       +2     
- Misses       1376     1380       +4     
- Partials      134      136       +2

Impacted Files	Coverage Δ
torchvision/datasets/utils.py	36.84% <18.18%> (+1.73%)	⬆️
torchvision/datasets/folder.py	74.39% <0%> (-1.61%)	⬇️
torchvision/transforms/functional.py	69.2% <0%> (-1.27%)	⬇️

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[soumith]

thanks!

[fmassa]

@pmeier just send a new PR