Fix undefined variable

[JackDunnNZ]

Fixes #11

[codecov-io]

Codecov Report

Merging #51 (f6dae33) into master (65d8955) will not change coverage.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##           master      #51   +/-   ##
=======================================
  Coverage   83.33%   83.33%           
=======================================
  Files           1        1           
  Lines         240      240           
=======================================
  Hits          200      200           
  Misses         40       40           

Impacted Files	Coverage Δ
src/GLMNet.jl	83.33% <33.33%> (ø)

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