Removes unused variable within /nmatrix/io/matrix
Removes unused variable within /nmatrix/io/matrix

wlevine/nmatrix,janusnic/nmatrix,agisga/nmatrix,johnmarinelli/nmatrix,agisga/nmatrix,johnmarinelli/nmatrix,janusnic/nmatrix,thisMagpie/nmatrix,johnmarinelli/nmatrix,wlevine/nmatrix,thisMagpie/nmatrix,janusnic/nmatrix,agisga/nmatrix,agisga/nmatrix,thisMagpie/nmatrix,johnmarinelli/nmatrix,wlevine/nmatrix,wlevine/nmatrix,thisMagpie/nmatrix,janusnic/nmatrix