built_in: Include stddef.h to avoid redefinition of offsetof() macro

The stddef.h header might define the offsetof() macro unconditionally,
leading to the macro being redefined if built_in.h is included _before_
stddef.h. This will lead sparse to complain as follows:

/usr/lib/gcc/x86_64-linux-gnu/4.8//include/stddef.h:413:9: warning: preprocessor token offsetof redefined
./built_in.h:151:10: this was the original definition

Fix this by explicitly including stddef.h in built_in.h

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 2 insertions, 1 deletions

diff --git a/built_in.h b/built_in.h
index 6ebf27e..d10579a 100644
--- a/built_in.h
+++ b/built_in.h
@@ -3,12 +3,13 @@
 
 /* Parts taken from the Linux kernel, GPL, version 2. */
 
+#include <stddef.h>
+#include <stdint.h>
 #include <linux/if_packet.h>
 #include <assert.h>
 #include <endian.h>
 #include <byteswap.h>
 #include <asm/byteorder.h>
-#include <stdint.h>
 
 typedef uint64_t	u64;
 typedef uint32_t	u32;