am 6606dc95: am 471157a3: charger: key state being the same is not an error

* commit '6606dc9532b20f55d18e0d9cc925358aa1ceb119':
  charger: key state being the same is not an error
diff --git a/charger/charger.c b/charger/charger.c
index aface7e..03280bf 100644
--- a/charger/charger.c
+++ b/charger/charger.c
@@ -756,7 +756,7 @@
 
     /* ignore events that don't modify our state */
     if (charger->keys[code].down == down)
-        return -1;
+        return 0;
 
     /* only record the down even timestamp, as the amount
      * of time the key spent not being pressed is not useful */