Remove SessionState from IFingerprint example

Bug: 183570051
Test: atest VtsHalBiometricsFingerprintTargetTest
Change-Id: I1dd4aa0dc8bd622824ad4c0c0dde78914c49838c
diff --git a/biometrics/fingerprint/aidl/default/include/FakeFingerprintEngine.h b/biometrics/fingerprint/aidl/default/include/FakeFingerprintEngine.h
index 42e1aa5..6667f7a 100644
--- a/biometrics/fingerprint/aidl/default/include/FakeFingerprintEngine.h
+++ b/biometrics/fingerprint/aidl/default/include/FakeFingerprintEngine.h
@@ -37,7 +37,7 @@
         cb->onEnrollmentProgress(0 /* enrollmentId */, 0 /* remaining */);
     }
 
-    void authenticateImpl(ISessionCallback* cb, int64_t /*operationId*/) {
+    void authenticateImpl(ISessionCallback* cb, int64_t /* operationId */) {
         LOG(INFO) << "authenticateImpl";
         cb->onAuthenticationSucceeded(0 /* enrollmentId */, {} /* hat */);
     }