fix(wifi): fix esp_wifi_scan_start memory leakage issue

Closes https://github.com/espressif/esp-idf/issues/10693

examples/wifi/ftm/main/ftm_main.c

@@ -304,6 +304,7 @@ static bool wifi_perform_scan(const char *ssid, bool internal)
     g_ap_list_buffer = malloc(g_scan_ap_num * sizeof(wifi_ap_record_t));
     if (g_ap_list_buffer == NULL) {
         ESP_LOGE(TAG_STA, "Failed to malloc buffer to print scan results");
+        esp_wifi_clear_ap_list();
         return false;
     }
 

examples/wifi/iperf/main/cmd_wifi.c

@@ -79,6 +79,7 @@ static void scan_done_handler(void *arg, esp_event_base_t event_base,
     ap_list_buffer = malloc(sta_number * sizeof(wifi_ap_record_t));
     if (ap_list_buffer == NULL) {
         ESP_LOGE(TAG, "Failed to malloc buffer to print scan results");
+        esp_wifi_clear_ap_list();
         return;
     }
 

examples/wifi/roaming/main/roaming_example.c

@@ -305,9 +305,7 @@ void neighbor_report_recv_cb(void *ctx, const uint8_t *report, size_t report_len
 			goto cleanup;
 		}
 		/* cleanup from net802.11 */
-		uint16_t number = 1;
-		wifi_ap_record_t ap_records;
-		esp_wifi_scan_get_ap_records(&number, &ap_records);
+		esp_wifi_clear_ap_list();
 		cand_list = 1;
 	}
 	/* send AP btm query, this will cause STA to roam as well */