The branch main has been updated by jhb:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=38731172ee2a487673ffeb294741fdde08a722d3

commit 38731172ee2a487673ffeb294741fdde08a722d3
Author:     John Baldwin <[email protected]>
AuthorDate: 2022-04-13 23:08:20 +0000
Commit:     John Baldwin <[email protected]>
CommitDate: 2022-04-13 23:08:20 +0000

    xen: Use __diagused for a variable only used in KASSERT().
---
 sys/xen/xenbus/xenbus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/xen/xenbus/xenbus.c b/sys/xen/xenbus/xenbus.c
index 415279ec2311..9570abac6a58 100644
--- a/sys/xen/xenbus/xenbus.c
+++ b/sys/xen/xenbus/xenbus.c
@@ -105,7 +105,7 @@ xenbus_strstate(XenbusState state)
 void
 xenbus_dev_verror(device_t dev, int err, const char *fmt, va_list ap)
 {
-       int ret;
+       int ret __diagused;
        unsigned int len;
        char *printf_buffer = NULL, *path_buffer = NULL;
 

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