[PATCH v06 14/36] arm uapi asm/signal.h: include <stddef.h> for size_t in userspace

Arnd Bergmann [off-list ref] doubts that __kernel_size_t could be used here
so trying to fall back to gcc's <stddef.h>.

Fixes uapi header compilation error from userspace on ARCH=arm:

asm/signal.h:112:2: error: unknown type name ?size_t?
  size_t ss_size;

Signed-off-by: Mikko Rapeli <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/include/uapi/asm/signal.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/include/uapi/asm/signal.h b/arch/arm/include/uapi/asm/signal.h
index 33073bdcf091..63066f624c10 100644
--- a/arch/arm/include/uapi/asm/signal.h
+++ b/arch/arm/include/uapi/asm/signal.h

@@ -12,6 +12,8 @@ struct siginfo;
 #define NSIG		32
 typedef unsigned long sigset_t;
 
+#include <stddef.h>
+
 #endif /* __KERNEL__ */
 
 #define SIGHUP		 1

-- 
2.13.3