Enum: rename variable in priv. func.
Enum: rename variable in priv. func.

rename variable according to changes introduced in commit ced1095e177c71b4022c1dc1cd209673b2f872d0

antipax/elixir,michalmuskala/elixir,elixir-lang/elixir,ggcampinho/elixir,lexmag/elixir,beedub/elixir,pedrosnk/elixir,pedrosnk/elixir,antipax/elixir,gfvcastro/elixir,joshprice/elixir,kelvinst/elixir,kimshrier/elixir,ggcampinho/elixir,gfvcastro/elixir,beedub/elixir,kelvinst/elixir,lexmag/elixir,kimshrier/elixir