Mark function that doesn't return as dead.
diff --git a/tar/bsdtar.h b/tar/bsdtar.h
index 9c551fc..10a2cf2 100644
--- a/tar/bsdtar.h
+++ b/tar/bsdtar.h
@@ -197,7 +197,7 @@
 void	tar_mode_t(struct bsdtar *bsdtar);
 void	tar_mode_u(struct bsdtar *bsdtar);
 void	tar_mode_x(struct bsdtar *bsdtar);
-void	usage(void);
+void	usage(void) __LA_DEAD;
 int	yes(const char *fmt, ...) __LA_PRINTF(1, 2);
 
 #if defined(HAVE_REGEX_H) || defined(HAVE_PCREPOSIX_H)