functions.m4: Make clearchain tolerant of existing chains.

It's a handy way to make chains which are populated elsewhere, e.g., by
fail2ban.

diff --git a/functions.m4 b/functions.m4
index b2e3cb6..fd24364 100644 (file)
--- a/functions.m4
+++ b/functions.m4
@@ -85,7 +85,7 @@ clearchain () {
       *:*) table=${chain%:*} chain=${chain#*:} ;;
       *) table=filter ;;
     esac
-    run ip46tables -t $table -N $chain
+    run ip46tables -t $table -N $chain 2>/dev/null || :
   done
 }