Use offsetof macro to silence null ptr subtraction warning

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

Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>

1 files changed, 1 insertions, 1 deletions

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;
 }