Add a max errno value.

This is not strictly needed but should improve reliability.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Serge E. Hallyn <serge@hallyn.com>
Cc: James Morris <redacted>
Cc: Kees Cook <redacted>
---
 include/uapi/asm-generic/errno-base.h | 1 +
 security/landlock/lsm.c               | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/uapi/asm-generic/errno-base.h b/include/uapi/asm-generic/errno-base.h
index 65115978510f..43407a403e72 100644
--- a/include/uapi/asm-generic/errno-base.h
+++ b/include/uapi/asm-generic/errno-base.h

@@ -35,5 +35,6 @@
 #define        EPIPE           32      /* Broken pipe */
 #define        EDOM            33      /* Math argument out of domain of func */
 #define        ERANGE          34      /* Math result not representable */
+#define        _ERRNO_LAST     ERANGE