Merge branch 'bugfix/esp_tls_error_logging' into 'master'

esp-tls: Expand error logging

See merge request idf/esp-idf!2284

components/esp-tls/esp_tls.c

@@ -83,6 +83,7 @@ static int esp_tcp_connect(const char *host, int hostlen, int port)
 
     int ret = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
     if (ret < 0) {
+        ESP_LOGE(TAG, "Failed to create socket (family %d socktype %d protocol %d)", res->ai_family, res->ai_socktype, res->ai_protocol);
         goto err_freeaddr;
     }
     int fd = ret;
@@ -98,12 +99,13 @@ static int esp_tcp_connect(const char *host, int hostlen, int port)
         p->sin6_family = AF_INET6;
         addr_ptr = p;
     } else {
-	/* Unsupported Protocol Family */
+        ESP_LOGE(TAG, "Unsupported protocol family %d", res->ai_family);
         goto err_freesocket;
     }
 
     ret = connect(fd, addr_ptr, res->ai_addrlen);
     if (ret < 0) {
+        ESP_LOGE(TAG, "Failed to connnect to host (errno %d)", errno);
         goto err_freesocket;
     }
 
@@ -234,11 +236,13 @@ exit:
  */
 void esp_tls_conn_delete(esp_tls_t *tls)
 {
-    mbedtls_cleanup(tls);
-    if (tls->sockfd) {
-        close(tls->sockfd);
+    if (tls != NULL) {
+        mbedtls_cleanup(tls);
+        if (tls->sockfd) {
+            close(tls->sockfd);
+        }
+        free(tls);
     }
-    free(tls);
 };
 
 static ssize_t tcp_write(esp_tls_t *tls, const char *data, size_t datalen)