contrib/rrd_filter.px: Remove the (unused) Data::Dumper.

diff --git a/contrib/rrd_filter.px b/contrib/rrd_filter.px
index 4c8d317..a212de5 100755 (executable)
--- a/contrib/rrd_filter.px
+++ b/contrib/rrd_filter.px
@@ -38,7 +38,6 @@ L<Getopt::Long> module.
 =cut
 
 use Getopt::Long ('GetOptions');
-use Data::Dumper ();
 
 our $InFile;
 our $InDS = [];