int protocol;
assert(u->service);
- if (u->buf & &strcasecmp (u->buf, "ipv4") == 0) {
+ if (u->buf && strcasecmp (u->buf, "ipv4") == 0) {
protocol = AVAHI_PROTO_INET;
} else if (u->buf && strcasecmp (u->buf, "ipv6") == 0) {
protocol = AVAHI_PROTO_INET6;