gcc8_newlib3: Compilation warnings and errors not specific to newlib v3

components/esp32/clk.c

@@ -88,7 +88,7 @@ void esp_clk_init(void)
             break;
         default:
             freq_mhz = 80;
-            /* no break */
+            /* falls through */
         case 80:
             freq = RTC_CPU_FREQ_80M;
             break;

components/esp32/include/esp_wifi_crypto_types.h

@@ -607,7 +607,7 @@ typedef void (*esp_uuid_gen_mac_addr_t)(const unsigned char *mac_addr, unsigned
  * @brief free the message after finish DH
  * 
  */
-typedef void * (*esp_dh5_free_t)(void *ctx);
+typedef void (*esp_dh5_free_t)(void *ctx);
 
 /**
  * @brief Build WPS IE for (Re)Association Request