fix(esp_netif): Free allocation if pppos_create fails (IDFGH-14642)

[nebkat]

Description

Detected by static analyzer.

ppp_obj is allocated but not freed before exit.

esp-idf/components/esp_netif/lwip/esp_netif_lwip_ppp.c

Lines 210 to 227 in 0d6099e

	netif_related_data_t * esp_netif_new_ppp(esp_netif_t *esp_netif, const esp_netif_netstack_config_t *esp_netif_stack_config)
	{
	struct netif * netif_impl = esp_netif->lwip_netif;
	struct lwip_peer2peer_ctx * ppp_obj = calloc(1, sizeof(struct lwip_peer2peer_ctx));
	if (ppp_obj == NULL) {
	ESP_LOGE(TAG, "%s: cannot allocate lwip_ppp_ctx", __func__);
	return NULL;
	}
	// Setup the generic esp-netif fields
	ppp_obj->base.is_point2point = true;
	ppp_obj->base.netif_type = PPP_LWIP_NETIF;
	ppp_obj->ppp = pppos_create(netif_impl, pppos_low_level_output, on_ppp_status_changed, esp_netif);
	ESP_LOGD(TAG, "%s: PPP connection created: %p", __func__, ppp_obj->ppp);
	if (!ppp_obj->ppp) {
	ESP_LOGE(TAG, "%s: lwIP PPP connection cannot be created", __func__);
	return NULL;
	}

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