confile: use correct check on char array

src/lxc/confile.c

@@ -3357,12 +3357,12 @@ static int get_config_network_item(const char *key, char *retv, int inlen,
 	if (!netdev)
 		return -1;
 	if (strcmp(p1, "name") == 0) {
-		if (netdev->name)
+		if (netdev->name[0] != '\0')
 			strprint(retv, inlen, "%s", netdev->name);
 	} else if (strcmp(p1, "type") == 0) {
 		strprint(retv, inlen, "%s", lxc_net_type_to_str(netdev->type));
 	} else if (strcmp(p1, "link") == 0) {
-		if (netdev->link)
+		if (netdev->link[0] != '\0')
 			strprint(retv, inlen, "%s", netdev->link);
 	} else if (strcmp(p1, "flags") == 0) {
 		if (netdev->flags & IFF_UP)
@@ -3404,7 +3404,7 @@ static int get_config_network_item(const char *key, char *retv, int inlen,
 	} else if (strcmp(p1, "veth.pair") == 0) {
 		if (netdev->type == LXC_NET_VETH) {
 			strprint(retv, inlen, "%s",
-				 netdev->priv.veth_attr.pair
+				 netdev->priv.veth_attr.pair[0] != '\0'
 				     ? netdev->priv.veth_attr.pair
 				     : netdev->priv.veth_attr.veth1);
 		}

src/lxc/confile_utils.c

@@ -256,7 +256,7 @@ void lxc_log_configured_netdevs(const struct lxc_conf *conf)
 		switch (netdev->type) {
 		case LXC_NET_VETH:
 			TRACE("type: veth");
-			if (netdev->priv.veth_attr.pair)
+			if (netdev->priv.veth_attr.pair[0] != '\0')
 				TRACE("veth pair: %s",
 				      netdev->priv.veth_attr.pair);
 			if (netdev->priv.veth_attr.veth1[0] != '\0')
@@ -291,9 +291,9 @@ void lxc_log_configured_netdevs(const struct lxc_conf *conf)
 		}
 
 		TRACE("flags: %s", netdev->flags == IFF_UP ? "up" : "none");
-		if (netdev->link)
+		if (netdev->link[0] != '\0')
 			TRACE("link: %s", netdev->link);
-		if (netdev->name)
+		if (netdev->name[0] != '\0')
 			TRACE("name: %s", netdev->name);
 		if (netdev->hwaddr)
 			TRACE("hwaddr: %s", netdev->hwaddr);