Port "Remove unused local variable"

Ported from cjlin1/liblinear@c5019d7

Author: bwaldvogel

src/main/java/de/bwaldvogel/liblinear/Newton.java

@@ -54,7 +54,6 @@ void newton(double[] w) {
         if (gnorm <= eps * gnorm0)
             search = false;
 
-        double[] w_new = new double[n];
         while (iter <= max_iter && search) {
             fun_obj.get_diag_preconditioner(M);
             for (i = 0; i < n; i++)