gc: fix bad c++ casts.

This C++ regression snuck into in Version 286; I didn't
check C++ compilation.

* lib.h (container): Macro must use coerce not
convert because mem_t * isn't void *.

* gc.c (gc_prot_array_alloc): Likewise.

1 files changed, 4 insertions, 4 deletions

diff --git a/gc.c b/gc.c
index 45106d8b..41f0c6d2 100644
--- a/gc.c
+++ b/gc.c
@@ -1323,11 +1323,11 @@ static struct cobj_ops prot_array_ops = cobj_ops_init(eq,
 
 val *gc_prot_array_alloc(cnum size)
 {
-  struct prot_array *pa = convert(struct prot_array *,
-                                  chk_calloc(offsetof(struct prot_array, arr) +
-                                             size * sizeof(val), 1));
+  struct prot_array *pa = coerce(struct prot_array *,
+                                 chk_calloc(offsetof(struct prot_array, arr) +
+                                            size * sizeof(val), 1));
   pa->size = size;
-  pa->self = cobj(convert(mem_t *, pa), prot_array_cls, &prot_array_ops);
+  pa->self = cobj(coerce(mem_t *, pa), prot_array_cls, &prot_array_ops);
 
   return pa->arr;
 }