cifs: remove unused variable 'sid_user'

fs/cifs/cifsacl.c:43:30: warning:
 sid_user defined but not used [-Wunused-const-variable=]

It is never used, so remove it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cifsacl.c

@@ -39,8 +39,6 @@ static const struct cifs_sid sid_everyone = {
 /* security id for Authenticated Users system group */
 static const struct cifs_sid sid_authusers = {
 	1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} };
-/* group users */
-static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} };
 
 /* S-1-22-1 Unmapped Unix users */
 static const struct cifs_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22},