[glib] OpenBSD: explicitely define nitems

[Antoine Jacoutot <ajacoutot src gnome org>]

commit f9a6a97470583417a26619b5da3d56097a15c6dd
Author: Antoine Jacoutot <ajacoutot gnome org>
Date:   Sun Jul 8 19:23:18 2012 +0200

    OpenBSD: explicitely define nitems
    
    nitems is never guaranteed to be defined in sys/params.h as it is meant
    to be defined within a protected ifdef __KERNEL condition.

 glib/goption.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/glib/goption.c b/glib/goption.c
index e405546..d34901e 100644
--- a/glib/goption.c
+++ b/glib/goption.c
@@ -1681,6 +1681,10 @@ platform_get_argv0 (void)
 
   cmdline = (char **) realloc (cmdline, len);
 
+#ifndef nitems
+#define nitems(_a)      (sizeof((_a)) / sizeof((_a)[0]))
+#endif
+
   if (sysctl (mib, nitems (mib), cmdline, &len, NULL, 0) == -1)
     {
       g_free (cmdline);