[gjs] arg: Fix accidental fallthrough

[Philip Chimento <pchimento src gnome org>]

commit c7fc8af31a5c7e2de7df42bda3470bd1911f1456
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Mar 8 17:50:07 2017 +0100

    arg: Fix accidental fallthrough
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779838

 gi/arg.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gi/arg.cpp b/gi/arg.cpp
index 93f7219..4f34f38 100644
--- a/gi/arg.cpp
+++ b/gi/arg.cpp
@@ -2029,6 +2029,7 @@ gjs_g_argument_init_default(JSContext      *context,
 
     case GI_TYPE_TAG_UINT64:
         arg->v_uint64 = 0;
+        break;
 
     case GI_TYPE_TAG_BOOLEAN:
         arg->v_boolean = false;