[CIFS] acl support part 7

Also fixes typo, build break

Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifsacl.h b/fs/cifs/cifsacl.h
index 06d5200..30b0caf 100644
--- a/fs/cifs/cifsacl.h
+++ b/fs/cifs/cifsacl.h
@@ -73,7 +73,7 @@
 #ifdef CONFIG_CIFS_EXPERIMENTAL
 
 extern int match_sid(struct cifs_sid *);
-extern int compare_sids(struct cifs_sid *, struct cifs_sid *);
+extern int compare_sids(const struct cifs_sid *, const struct cifs_sid *);
 
 #endif /*  CONFIG_CIFS_EXPERIMENTAL */