Fix null termination of arguments list in starter

Change-Id: Ia0753f59783da508e29869741e6d4b9a12918332
diff --git a/aos/starter/starterd_lib.cc b/aos/starter/starterd_lib.cc
index 9d74089..5c64201 100644
--- a/aos/starter/starterd_lib.cc
+++ b/aos/starter/starterd_lib.cc
@@ -20,6 +20,7 @@
       path_(application->has_executable_name()
                 ? application->executable_name()->string_view()
                 : application->name()->string_view()),
+      args_(1),
       user_(application->has_user() ? FindUid(application->user()->c_str())
                                     : std::nullopt),
       event_loop_(event_loop),