lacp: Require non-zero system ID.

It's a bug if LACP is configured with a system ID of zero.  This
patch assert fails in this case.

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/lacp.c b/lib/lacp.c
index 22cba942..6ee55c36 100644
--- a/lib/lacp.c
+++ b/lib/lacp.c
@@ -224,6 +224,8 @@ lacp_destroy(struct lacp *lacp)
 void
 lacp_configure(struct lacp *lacp, const struct lacp_settings *s)
 {
+    assert(!eth_addr_is_zero(s->id));
+
     if (!lacp->name || strcmp(s->name, lacp->name)) {
         free(lacp->name);
         lacp->name = xstrdup(s->name);