IMEMO objects don't have a class, so return early

IMEMO objects don't have a class field to update, so we need to return
early, otherwise it can cause a segv.

1 files changed, 1 insertions, 1 deletions

diff --git a/gc.c b/gc.c
index 48e8becc7d..86c9c672c8 100644
--- a/gc.c
+++ b/gc.c
@@ -8068,7 +8068,7 @@ gc_update_object_references(rb_objspace_t *objspace, VALUE obj)
 
       case T_IMEMO:
         gc_ref_update_imemo(objspace, obj);
-        break;
+        return;
 
       case T_NIL:
       case T_FIXNUM: