The branch main has been updated by jhb:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=8e9db62e7423eed795291ac88622fbed018b6abd

commit 8e9db62e7423eed795291ac88622fbed018b6abd
Author:     John Baldwin <[email protected]>
AuthorDate: 2023-04-10 17:36:14 +0000
Commit:     John Baldwin <[email protected]>
CommitDate: 2023-04-10 17:36:14 +0000

    zfs: Appease set by unused warnings for spl_fstrans_*mark stubs.
    
    Use a void cast to mark the cookie value as used in spl_fstrans_unmark.
    
    Reported by:    GCC
    Differential Revision:  https://reviews.freebsd.org/D39357
---
 sys/contrib/openzfs/include/os/freebsd/zfs/sys/zfs_context_os.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/contrib/openzfs/include/os/freebsd/zfs/sys/zfs_context_os.h 
b/sys/contrib/openzfs/include/os/freebsd/zfs/sys/zfs_context_os.h
index 1ce72330412c..457fa3af8142 100644
--- a/sys/contrib/openzfs/include/os/freebsd/zfs/sys/zfs_context_os.h
+++ b/sys/contrib/openzfs/include/os/freebsd/zfs/sys/zfs_context_os.h
@@ -78,7 +78,7 @@ extern int hz;
 extern int tick;
 typedef int fstrans_cookie_t;
 #define        spl_fstrans_mark() (0)
-#define        spl_fstrans_unmark(x) (x = 0)
+#define        spl_fstrans_unmark(x) ((void)x)
 #define        signal_pending(x) SIGPENDING(x)
 #define        current curthread
 #define        thread_join(x)

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