Fix sort! return type.

[maleadt]

Fixes #1270

[codecov]

Codecov Report

Merging #1272 (01665dd) into master (9636915) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1272      +/-   ##
==========================================
- Coverage   78.95%   78.94%   -0.01%     
==========================================
  Files         119      119              
  Lines        8544     8627      +83     
==========================================
+ Hits         6746     6811      +65     
- Misses       1798     1816      +18     

Impacted Files	Coverage Δ
src/sorting.jl	24.09% <100.00%> (+0.09%)	⬆️
lib/utils/threading.jl	74.07% <0.00%> (-1.93%)	⬇️
src/utilities.jl	78.46% <0.00%> (-1.87%)	⬇️
lib/cudnn/CUDNN.jl	74.60% <0.00%> (-1.21%)	⬇️
lib/cudnn/convolution.jl	67.05% <0.00%> (-0.80%)	⬇️
lib/cudnn/rnn.jl	73.04% <0.00%> (-0.65%)	⬇️
src/pool.jl	76.79% <0.00%> (-0.60%)	⬇️
lib/cublas/CUBLAS.jl	76.57% <0.00%> (-0.49%)	⬇️
src/state.jl	79.09% <0.00%> (-0.45%)	⬇️
lib/cufft/fft.jl	86.95% <0.00%> (-0.23%)	⬇️
... and 21 more

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