esp32: Use check_esp_err() for get error message. #8830
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I suggest making the path to understanding the error easier.
First, all esp-idf errors will have native error messages. For example:
ESP_ERR_ESP_NETIF_DNS_NOT_CONFIGURED will be output, not
Wifi Unknown Error 0x500A
Second, ESP_ERR_XXX_XXX error codes have more info in Google search requests.