Fix build due to unused variable in some cases

src/app/clusters/network-commissioning/network-commissioning.cpp

@@ -54,9 +54,6 @@ namespace {
 // For WiFi and Thread scan results, each item will cost ~60 bytes in TLV, thus 15 is a safe upper bound of scan results.
 constexpr size_t kMaxNetworksInScanResponse = 15;
 
-// The maximum number of Wi-Fi bands a device can support.
-constexpr size_t kMaxWiFiBands = 6;
-
 #if CHIP_DEVICE_CONFIG_ENABLE_WIFI_PDC
 constexpr size_t kPossessionNonceSize = 32;
 #endif // CHIP_DEVICE_CONFIG_ENABLE_WIFI_PDC
@@ -274,7 +271,8 @@ CHIP_ERROR Instance::Read(const ConcreteReadAttributePath & aPath, AttributeValu
         return CHIP_IM_GLOBAL_STATUS(UnsupportedAttribute);
 #else
         VerifyOrReturnError(mFeatureFlags.Has(Feature::kWiFiNetworkInterface), CHIP_IM_GLOBAL_STATUS(UnsupportedAttribute));
-
+        // The maximum number of Wi-Fi bands a device can support.
+        constexpr size_t kMaxWiFiBands = 6;
         return aEncoder.EncodeList([this](const auto & encoder) -> CHIP_ERROR {
             WiFiBand bandsBuffer[kMaxWiFiBands];
             Span<WiFiBand> bands(bandsBuffer);