fixed check for interface name length

accel-pppd/ctrl/ipoe/ipoe.c

@@ -2932,7 +2932,7 @@ static void add_vlan_mon(const char *opt, long *mask)
 
 	for (ptr = opt; *ptr && *ptr != ','; ptr++);
 
-	if (ptr - opt >= sizeof(ifr.ifr_name)) {
+	if (ptr - opt >= IFNAMSIZ) {
 		log_error("ipoe: vlan-mon=%s: interface name is too long\n", opt);
 		return;
 	}

accel-pppd/ifcfg.c

@@ -265,7 +265,7 @@ int __export ap_session_rename(struct ap_session *ses, const char *ifname, int l
 	if (len == -1)
 		len = strlen(ifname);
 
-	if (len >= IFNAMSIZ - 1) {
+	if (len >= IFNAMSIZ) {
 		log_ppp_warn("cannot rename interface (name is too long)\n");
 		return -1;
 	}