Fix ServiceNotFoundException error log when pressing power button on a

device that doesn't have fingerprint sensor.

Test: verified that the error is gone on a watch
Change-Id: I9e15180b7f395d2e0fc3317f70daec44cf39ce81

services/core/java/com/android/server/policy/SideFpsEventHandler.java

@@ -127,7 +127,7 @@ public class SideFpsEventHandler implements View.OnClickListener {
      */
     public void notifyPowerPressed() {
         Log.i(TAG, "notifyPowerPressed");
-        if (mFingerprintManager == null) {
+        if (mFingerprintManager == null && mSideFpsEventHandlerReady.get()) {
             mFingerprintManager = mContext.getSystemService(FingerprintManager.class);
         }
         if (mFingerprintManager == null) {