cstyle fixes
dsl_dataset_set_fsid_guid should use ZFS_SPACE_CHECK_RESERVED
dsl_dataset_set_fsid_guid _check and _sync func declared static,
removed from dsl_dataset.h
rewrite unique_valid
6333 ZFS should let the user specify or modify the fsid_guid of a dataset

@@ -600,10 +600,12 @@
                 clp->cl_allchildren = B_TRUE;
         } else if (prop == ZFS_PROP_CANMOUNT) {
                 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
         } else if (prop == ZFS_PROP_VOLSIZE) {
                 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
+        } else if (prop == ZFS_PROP_FSID_GUID) {
+                clp->cl_prop = ZFS_PROP_MOUNTPOINT;
         } else {
                 clp->cl_prop = prop;
         }
         clp->cl_realprop = prop;