[PATCH] sparse: Use offsetof macro to silence null ptr subtraction warning

[Richard Palethorpe <rpalethorpe@xxxxxxxx>]

Subtracting (char *)0 is undefined behavior. Newer compilers warn
about this unless it is done in system headers.

Signed-off-by: Richard Palethorpe <rpalethorpe@xxxxxxxx>
---
 token.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/token.h b/token.h
index bccac0e4..9000e0cb 100644
--- a/token.h
+++ b/token.h
@@ -201,7 +201,7 @@ struct token {
 
 static inline struct token *containing_token(struct token **p)
 {
-	void *addr = (char *)p - ((char *)&((struct token *)0)->next - (char *)0);
+	void *addr = (char *)p - offsetof(struct token, next);
 	return addr;
 }
 
-- 
2.35.1