wifi: Fix removeIfaceInstanceFromBridgedApIfaceInternal

Fix the incorrect empty check.

Bug: 162686273
Test: Manual Test, shutdown instance works normally

Change-Id: I44c5c4adcc7a964e25b5fa5e291bb9b9f4932655
diff --git a/wifi/1.5/default/wifi_chip.cpp b/wifi/1.5/default/wifi_chip.cpp
index 6dd400c..a37fee2 100644
--- a/wifi/1.5/default/wifi_chip.cpp
+++ b/wifi/1.5/default/wifi_chip.cpp
@@ -1031,7 +1031,7 @@
     const std::string& ifname, const std::string& ifInstanceName) {
     legacy_hal::wifi_error legacy_status;
     const auto iface = findUsingName(ap_ifaces_, ifname);
-    if (!iface.get() || !ifInstanceName.empty()) {
+    if (!iface.get() || ifInstanceName.empty()) {
         return createWifiStatus(WifiStatusCode::ERROR_INVALID_ARGS);
     }
     // Requires to remove one of the instance in bridge mode