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>

usr/src/lib/libzfs/common/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.
  * Copyright (c) 2014 by Delphix. All rights reserved.
  */
@@ -831,7 +832,7 @@ 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)));
 	}