Fix unintentional fall-through in switch.

Test: compiles
Change-Id: I17f44cbe8e2c21ff54b4019604b4b9045bce2db6
diff --git a/libs/binder/Binder.cpp b/libs/binder/Binder.cpp
index 7ce2a31..d9d8698 100644
--- a/libs/binder/Binder.cpp
+++ b/libs/binder/Binder.cpp
@@ -244,6 +244,8 @@
             if (resultReceiver != NULL) {
                 resultReceiver->send(INVALID_OPERATION);
             }
+
+            return NO_ERROR;
         }
 
         case SYSPROPS_TRANSACTION: {