nnet3 lstm train script bug fix

egs/wsj/s5/steps/nnet3/lstm/train.sh

@@ -588,7 +588,7 @@ while [ $x -lt $num_iters ]; do
           $fn = sprintf($pat,$n); open(F, "<$fn") || die "Error opening log file $fn";
           undef $logprob; while (<F>) { if (m/log-prob-per-frame=(\S+)/) { $logprob=$1; } }
           close(F); if (defined $logprob && $logprob > $best_logprob) { $best_logprob=$logprob;
-          $best_n=$n; } } print "$best_n\n"; ' $num_jobs_nnet $dir/log/train.$x.%d.log) || exit 1;
+          $best_n=$n; } } print "$best_n\n"; ' $this_num_jobs $dir/log/train.$x.%d.log) || exit 1;
       [ -z "$n" ] && echo "Error getting best model" && exit 1;
       $cmd $dir/log/select.$x.log \
         nnet3-am-copy --set-raw-nnet=$dir/$[$x+1].$n.raw  $dir/$x.mdl $dir/$[$x+1].mdl || exit 1;