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Fix DMRAID partition handling

https://bugs.gentoo.org/show_bug.cgi?id=430748
https://savannah.gnu.org/bugs/?37073
http://bzr.savannah.gnu.org/lh/grub/trunk/grub/revision/4858

=== modified file 'util/getroot.c'
--- util/getroot.c	2013-04-12 20:37:59 +0000
+++ util/getroot.c	2013-04-15 06:37:13 +0000
@@ -1956,6 +1956,7 @@
 	      grub_util_info ("dm_tree_find_node failed");
 	      goto devmapper_out;
 	    }
+	reiterate:
 	  node_uuid = dm_tree_node_get_uuid (node);
 	  if (! node_uuid)
 	    {
@@ -2030,6 +2031,9 @@
 	      goto devmapper_out;
 	    }
 	  mapper_name = child_name;
+	  *is_part = 1;
+	  node = child;
+	  goto reiterate;
 
 devmapper_out:
 	  if (! mapper_name && node)