feat(http_server): httpd register handler strdup failure case check

In httpd_register_uri_handler api, for the strdup function failure case was not
checked and not returned any error by freeing previously allocated memory, if the memory
allocation for strdup function did not gets successful.

Closes #15878

Author: hrushikesh430

components/esp_http_server/src/httpd_uri.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2018-2021 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2018-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -171,6 +171,12 @@ esp_err_t httpd_register_uri_handler(httpd_handle_t handle,
             hd->hd_calls[i]->handle_ws_control_frames = uri_handler->handle_ws_control_frames;
             if (uri_handler->supported_subprotocol) {
                 hd->hd_calls[i]->supported_subprotocol = strdup(uri_handler->supported_subprotocol);
+                if (hd->hd_calls[i]->supported_subprotocol == NULL) {
+                    /* Failed to allocate memory */
+                    free((void *)hd->hd_calls[i]->uri);
+                    free(hd->hd_calls[i]);
+                    return ESP_ERR_HTTPD_ALLOC_MEM;
+                }
             } else {
                 hd->hd_calls[i]->supported_subprotocol = NULL;
             }