ESP32: Do not read the ap record if esp_wifi_scan_start() is not called by NetworkCommissioningDriver (project-chip#27161) (project-chip#28045)

Author: wqx6

src/platform/ESP32/NetworkCommissioningDriver.cpp

@@ -297,16 +297,18 @@ CHIP_ERROR ESPWiFiDriver::StartScanWiFiNetworks(ByteSpan ssid)
 
 void ESPWiFiDriver::OnScanWiFiNetworkDone()
 {
+    if (!mpScanCallback)
+    {
+        ChipLogProgress(DeviceLayer, "No scan callback");
+        return;
+    }
     uint16_t ap_number;
     esp_wifi_scan_get_ap_num(&ap_number);
     if (!ap_number)
     {
         ChipLogProgress(DeviceLayer, "No AP found");
-        if (mpScanCallback != nullptr)
-        {
-            mpScanCallback->OnFinished(Status::kSuccess, CharSpan(), nullptr);
-            mpScanCallback = nullptr;
-        }
+        mpScanCallback->OnFinished(Status::kSuccess, CharSpan(), nullptr);
+        mpScanCallback = nullptr;
         return;
     }
 
@@ -317,11 +319,8 @@ void ESPWiFiDriver::OnScanWiFiNetworkDone()
     if (ap_buffer_ptr == NULL)
     {
         ChipLogError(DeviceLayer, "can't malloc memory for ap_list_buffer");
-        if (mpScanCallback)
-        {
-            mpScanCallback->OnFinished(Status::kUnknownError, CharSpan(), nullptr);
-            mpScanCallback = nullptr;
-        }
+        mpScanCallback->OnFinished(Status::kUnknownError, CharSpan(), nullptr);
+        mpScanCallback = nullptr;
         return;
     }
     wifi_ap_record_t * ap_list_buffer = ap_buffer_ptr.get();
@@ -343,16 +342,19 @@ void ESPWiFiDriver::OnScanWiFiNetworkDone()
         {
             ap_buffer_ptr.release();
         }
-    }
-    else
-    {
-        ChipLogError(DeviceLayer, "can't get ap_records ");
-        if (mpScanCallback)
+        else
         {
+            ChipLogError(DeviceLayer, "can't schedule the scan result processing");
             mpScanCallback->OnFinished(Status::kUnknownError, CharSpan(), nullptr);
             mpScanCallback = nullptr;
         }
     }
+    else
+    {
+        ChipLogError(DeviceLayer, "can't get ap_records ");
+        mpScanCallback->OnFinished(Status::kUnknownError, CharSpan(), nullptr);
+        mpScanCallback = nullptr;
+    }
 }
 
 void ESPWiFiDriver::OnNetworkStatusChange()