[PATCH 5.10 137/149] uapi/linux/stddef.h: Add include guards

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From: Tadeusz Struk <tadeusz.struk@xxxxxxxxxx>

commit 55037ed7bdc62151a726f5685f88afa6a82959b1 upstream.

Add include guard wrapper define to uapi/linux/stddef.h to prevent macro
redefinition errors when stddef.h is included more than once. This was not
needed before since the only contents already used a redefinition test.

Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220329171252.57279-1-tadeusz.struk@xxxxxxxxxx
Fixes: 50d7bd38c3aa ("stddef: Introduce struct_group() helper macro")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 include/uapi/linux/stddef.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/include/uapi/linux/stddef.h
+++ b/include/uapi/linux/stddef.h
@@ -1,4 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_LINUX_STDDEF_H
+#define _UAPI_LINUX_STDDEF_H
+
 #include <linux/compiler_types.h>
 
 #ifndef __always_inline
@@ -25,3 +28,4 @@
 		struct { MEMBERS } ATTRS; \
 		struct TAG { MEMBERS } ATTRS NAME; \
 	}
+#endif





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