symmetry with create_bridge

weave

@@ -287,7 +287,9 @@ destroy_bridge() {
     if [ -d /sys/class/net/$BRIDGE ] ; then
         ip link del dev $BRIDGE
     fi
-    run_iptables -t filter -D FORWARD -i $DOCKER_BRIDGE -o $BRIDGE -j DROP 2>/dev/null || true
+    if [ "$DOCKER_BRIDGE" != "$BRIDGE" ] ; then
+        run_iptables -t filter -D FORWARD -i $DOCKER_BRIDGE -o $BRIDGE -j DROP 2>/dev/null || true
+    fi
     run_iptables -t filter -D FORWARD -i $BRIDGE -o $BRIDGE -j ACCEPT 2>/dev/null || true
     run_iptables -t nat -F WEAVE >/dev/null 2>&1 || true
     run_iptables -t nat -D POSTROUTING -j WEAVE >/dev/null 2>&1 || true