layer2: Remove reference to removed method
The spam() method was removed in a previous commit, so replace this
reference in a comment to the updated call to gratuitous().
@@ -155,7 +155,7 @@ func (a *Announce) spamLoop() {
m[ipStr] = time.Now().Add(5 * time.Second)
if !ok {
// Spam right away to avoid waiting up to 1100 milliseconds even if
- // it means we call spam() twice in a row in a short amount of time.
+ // it means we call gratuitous() twice in a row in a short amount of time.
a.gratuitous(ip)
}
case now := <-ticker.C:
