ffi: gc bug in ffi_enum_type.

This is reproducible using

 ./txr --gc-debug tests/017/ffi-misc.tl

* ffi.c (ffi_enum_type_mark): We must mark the tft->eltype
because enumerations use that member.

1 files changed, 1 insertions, 0 deletions

diff --git a/ffi.c b/ffi.c
index e97eadb5..f293b59b 100644
--- a/ffi.c
+++ b/ffi.c
@@ -335,6 +335,7 @@ static void ffi_enum_type_mark(val obj)
   ffi_type_common_mark(tft);
   gc_mark(tft->sym_num);
   gc_mark(tft->num_sym);
+  gc_mark(tft->eltype);
 }
 
 static struct cobj_ops ffi_type_builtin_ops =