git: 94fb5053dabd - stable/13 - subr_unit.c: another attempt to fix the build

From: Konstantin Belousov <kib_at_FreeBSD.org>
Date: Fri, 25 Aug 2023 01:08:44 UTC 
The branch stable/13 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=94fb5053dabdb0e5877d246b6569f37d680290fb

commit 94fb5053dabdb0e5877d246b6569f37d680290fb
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2023-08-18 15:42:59 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2023-08-25 01:06:45 +0000

    subr_unit.c: another attempt to fix the build
    
    (cherry picked from commit 04f683b25a81ad47c998e3e496419c08ae4905eb)
---
 sys/kern/subr_unit.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/kern/subr_unit.c b/sys/kern/subr_unit.c
index 4fb2bb3790e2..3cac6a7da264 100644
--- a/sys/kern/subr_unit.c
+++ b/sys/kern/subr_unit.c
@@ -353,6 +353,10 @@ free_iter_unr(void *handle)
 }
 
 #if defined(DIAGNOSTIC) || !defined(_KERNEL)
+#ifndef __diagused
+#define	__diagused
+#endif
+
 /*
  * Consistency check function.
  *