SELinux: correct error code in selinux_audit_rule_init

Corrects an error code so that it is valid to pass to userspace.

Signed-off-by: Steve Grubb <linux_4ever@yahoo.com>
Signed-off-by: James Morris <jmorris@halo.namei>
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index f00161e..6100fc0 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -2127,7 +2127,7 @@
 	*rule = NULL;
 
 	if (!ss_initialized)
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	switch (field) {
 	case AUDIT_SUBJ_USER: