hlist.h: Add missing stddef.h include for NULL

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/urcu/hlist.h b/urcu/hlist.h
index e3b94ced234f61a721a52cef7a19fec543c63b5a..82015b36fa1aa32a795fa556df52f76d9a342121 100644 (file)
--- a/urcu/hlist.h
+++ b/urcu/hlist.h
@@ -16,6 +16,8 @@
  * published by the Free  Software Foundation.
  */
 
+#include <stddef.h>
+
 struct cds_hlist_head
 {
        struct cds_hlist_node *next;