sprintf rudundancy warnings

bin/pt-index-usage

@@ -3530,8 +3530,8 @@ sub shorten {
    }
    return sprintf(
       $num =~ m/\./ || $n
-         ? "%.${p}f%s"
-         : '%d',
+         ? '%1$.'.$p.'f%2$s'
+         : '%1$d',
       $num, $units[$n]);
 }
 
@@ -4918,11 +4918,10 @@ sub new {
       last_reported => $args{start},
       fraction      => 0,       # How complete the job is
       callback      => sub {
-         my ($fraction, $elapsed, $remaining, $eta) = @_;
+         my ($fraction, $elapsed, $remaining) = @_;
          printf STDERR "$name: %3d%% %s remain\n",
             $fraction * 100,
-            Transformers::secs_to_time($remaining),
-            Transformers::ts($eta);
+            Transformers::secs_to_time($remaining);
       },
       %args,
    };