Patch for 'zfs send -R' core dump (pr bin/130105)

[George Hartzell]

The following patch to

  /usr/src/sys/cddl/contrib/opensolaris/common/zfs/zfs_prop.c

seems to keep 'zfs send -R' from dumping core.  I've only been able to
test sending the stream to /dev/null or a file, I'm still setting up a
pool to do the receiving.

This is based on a bit of gdb debugging and a thread from zfs-fuse:

   http://groups.google.com/group/zfs-fuse/browse_thread/thread/158cb78bc3325ae3/6a0109c7b0942707?#6a0109c7b0942707

g.

--- zfs_prop.c	2009/02/17 18:58:58	1.1
+++ zfs_prop.c	2009/02/19 09:54:04
@@ -297,7 +297,7 @@
 
 	/* hidden properties */
 	register_hidden(ZFS_PROP_CREATETXG, "createtxg", PROP_TYPE_NUMBER,
-	    PROP_READONLY, ZFS_TYPE_DATASET, NULL);
+	    PROP_READONLY, ZFS_TYPE_DATASET, "CREATETXG");
 	register_hidden(ZFS_PROP_NUMCLONES, "numclones", PROP_TYPE_NUMBER,
 	    PROP_READONLY, ZFS_TYPE_SNAPSHOT, NULL);
 	register_hidden(ZFS_PROP_NAME, "name", PROP_TYPE_STRING,