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.

2 files changed, 6 insertions, 6 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;
 }
diff --git a/lib.h b/lib.h
index dc90aa23..8448db55 100644
--- a/lib.h
+++ b/lib.h
@@ -47,8 +47,8 @@ typedef double_uintptr_t dbl_ucnum;
 #endif
 
 #define container(PTR, TYPE, MEMB)                          \
-  convert(TYPE *,                                           \
-          convert(mem_t *, (PTR)) - offsetof(TYPE, MEMB))
+  coerce(TYPE *,                                            \
+         coerce(mem_t *, (PTR)) - offsetof(TYPE, MEMB))
 
 #if __STDC_VERSION__ >= 199901L
 #define FLEX_ARRAY