git: 90597773cdd2 - main - Mark usage function as __dead2 in programs where it does not return

The branch main has been updated by imp:

URL: https://cgit.FreeBSD.org/src/commit/?id=90597773cdd25fc28a9149900be50d000bb311b5

commit 90597773cdd25fc28a9149900be50d000bb311b5
Author:     Alfonso Gregory <gfunni234@gmail.com>
AuthorDate: 2023-07-07 16:39:23 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2023-07-07 16:45:17 +0000

    Mark usage function as __dead2 in programs where it does not return
    
    In most cases, usage does not return, so mark them as __dead2. For the
    cases where they do return, they have not been marked __dead2.
    
    Reviewed by: imp
    Pull Request: https://github.com/freebsd/freebsd-src/pull/735
---
 tools/regression/sysvshm/shmtest.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/regression/sysvshm/shmtest.c b/tools/regression/sysvshm/shmtest.c
index c3e5962d9fa1..c84ddfd7657d 100644
--- a/tools/regression/sysvshm/shmtest.c
+++ b/tools/regression/sysvshm/shmtest.c
@@ -54,7 +54,7 @@ static void sigsys_handler(int);
 static void sigchld_handler(int);
 static void cleanup(void);
 static void receiver(void);
-static void usage(void);
+static void usage(void) __dead2;
 
 static const char *m_str = "The quick brown fox jumped over the lazy dog.";