altos: Wrap ao_container_of value in parens

Keeps the cast from being separated from the value when used
in expressions.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/core/ao_list.h b/src/core/ao_list.h
index 23cf18417ed7f292bb3ecdc728131232207909d1..8a6fa4d92eb90571ec949f3db17a02215b9e90df 100644 (file)
--- a/src/core/ao_list.h
+++ b/src/core/ao_list.h
@@ -137,7 +137,7 @@ ao_list_is_empty(struct ao_list *head)
  * @return A pointer to the data struct containing the list head.
  */
 #define ao_container_of(ptr, type, member) \
-    (type *)((char *)(ptr) - offsetof(type, member))
+       ((type *)((char *)(ptr) - offsetof(type, member)))
 
 /**
  * Alias of ao_container_of