use the standard printf since echo -n isn't as portable

plugins/node.d.freebsd/df_inode.in

@@ -22,7 +22,7 @@ print_values() {
 		mfs:*) name=mfs$mfs; mfs=`expr $mfs + 1`;;
 		*) name=`echo $i | awk '{ gsub("[^a-zA-Z0-9_]", "_", $1); print $1 }'` ;;
 		esac
-		echo -n "$name.value "
+		printf "$name.value "
 		echo $i | awk '{ print $8 }' | cut -f1 -d%
 	done
 }