Fix typo in hflip in functional.py

[oscmansan]

No description provided.

[codecov-io]

Codecov Report

Merging #2177 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2177   +/-   ##
======================================
  Coverage    0.48%   0.48%           
======================================
  Files          92      92           
  Lines        7442    7442           
  Branches     1135    1135           
======================================
  Hits           36      36           
  Misses       7393    7393           
  Partials       13      13           

Impacted Files	Coverage Δ
torchvision/transforms/functional.py	0.00% <ø> (ø)

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[fmassa]

Thanks!