Illumos 6280 - libzfs: unshare_one() could fail with EZFS_SHARENFSFAILED

6280 libzfs: unshare_one() could fail with EZFS_SHARENFSFAILED
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Gordon Ross <gwr@nexenta.com>

References:
  https://www.illumos.org/issues/6280
  illumos/illumos-gate@d1672ef

Ported-by: kernelOfTruth kerneloftruth@gmail.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

lib/libzfs/libzfs_mount.c

@@ -20,6 +20,7 @@
  */
 
 /*
+ * Copyright 2015 Nexenta Systems, Inc.  All rights reserved.
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  */
 
@@ -857,7 +858,7 @@ unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint,
 	/* make sure libshare initialized */
 	if ((err = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
 		free(mntpt);	/* don't need the copy anymore */
-		return (zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
+		return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
 		    dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
 		    name, sa_errorstr(err)));
 	}