audit: replace zero-length array with flexible-array member

Zero-length arrays are deprecated and should be replaced with
flexible-array members.

Link: https://github.com/KSPP/linux/issues/78Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

include/uapi/linux/audit.h

@@ -514,7 +514,7 @@ struct audit_rule_data {
 	__u32		values[AUDIT_MAX_FIELDS];
 	__u32		fieldflags[AUDIT_MAX_FIELDS];
 	__u32		buflen;	/* total length of string fields */
-	char		buf[0];	/* string fields buffer */
+	char		buf[];	/* string fields buffer */
 };
 
 #endif /* _UAPI_LINUX_AUDIT_H_ */