lib/sod.h: Arrange that `SOD_XCHAIN' returns `void *'.

diff --git a/lib/sod.h b/lib/sod.h
index af34d5d..efac06b 100644 (file)
--- a/lib/sod.h
+++ b/lib/sod.h
@@ -76,14 +76,15 @@ struct sod_chain {
  * Arguments:  @chead@ = nickname of target chain's head
  *             @obj@ = pointer to an instance chain
  *
- * Returns:    Pointer to target chain, as a @char *@.
+ * Returns:    Pointer to target chain, as a @void *@.
  *
  * Use:                Utility for implementing cross-chain upcasts.  It's probably
  *             not that clever to use this macro directly; it's used to make
  *             the automatically-generated upcast macros more palatable.
  */
 
-#define SOD_XCHAIN(chead, obj) ((char *)(obj) + (obj)->_vt->_off_##chead)
+#define SOD_XCHAIN(chead, obj)                                         \
+  ((void *)((char *)(obj) + (obj)->_vt->_off_##chead))
 
 /* --- @SOD_OFFSETDIFF@ --- *
  *