Convert RootHelperBackend to Kotlin

lawnchair/src/app/lawnchair/root/RootHelperBackend.java

@@ -1,24 +0,0 @@
-package app.lawnchair.root;
-
-import android.content.Context;
-import android.os.PowerManager;
-import android.os.SystemClock;
-
-import androidx.core.content.ContextCompat;
-
-public class RootHelperBackend extends IRootHelper.Stub {
-    private final Context mContext;
-
-    public RootHelperBackend(Context context) {
-        mContext = context;
-    }
-
-    private PowerManager getPowerManager() {
-        return ContextCompat.getSystemService(mContext, PowerManager.class);
-    }
-
-    @Override
-    public void goToSleep() {
-        getPowerManager().goToSleep(SystemClock.uptimeMillis());
-    }
-}

lawnchair/src/app/lawnchair/root/RootHelperBackend.kt

@@ -0,0 +1,14 @@
+package app.lawnchair.root
+
+import android.content.Context
+import android.os.PowerManager
+import android.os.SystemClock
+import androidx.core.content.getSystemService
+
+class RootHelperBackend(private val mContext: Context) : IRootHelper.Stub() {
+    private val powerManager: PowerManager? get() = mContext.getSystemService()
+
+    override fun goToSleep() {
+        powerManager.goToSleep(SystemClock.uptimeMillis())
+    }
+}