Don't initialize the API when setting log callbacks.

[maleadt]

As spotted in #978

[codecov]

Codecov Report

Merging #992 (8ddd314) into master (c77e985) will decrease coverage by 0.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #992      +/-   ##
==========================================
- Coverage   78.75%   78.14%   -0.62%     
==========================================
  Files         122      122              
  Lines        7918     7970      +52     
==========================================
- Hits         6236     6228       -8     
- Misses       1682     1742      +60     

Impacted Files	Coverage Δ
lib/cusolver/error.jl	30.76% <0.00%> (-53.85%)	⬇️
src/broadcast.jl	75.00% <0.00%> (-10.72%)	⬇️
lib/cudnn/dropout.jl	90.32% <0.00%> (-9.68%)	⬇️
lib/cublas/util.jl	82.22% <0.00%> (-8.03%)	⬇️
lib/cusolver/base.jl	55.55% <0.00%> (-6.95%)	⬇️
lib/cudnn/softmax.jl	69.23% <0.00%> (-5.77%)	⬇️
lib/cudnn/activation.jl	71.42% <0.00%> (-5.50%)	⬇️
lib/cusolver/CUSOLVER.jl	78.00% <0.00%> (-5.34%)	⬇️
lib/cudnn/optensor.jl	76.47% <0.00%> (-4.78%)	⬇️
lib/cudnn/reduce.jl	63.33% <0.00%> (-4.53%)	⬇️
... and 16 more

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