Fix grub partnumber.

pym/cl_fill_install.py

@@ -310,8 +310,8 @@ class fillVars(object, glob_attr):
             dev_hash['options'] = fstab.getBy(what=fstab.OPTS,eq=devName) or ""
             dev_hash['size'] = getPartitionSize(disk)
             if devParent in devicesHash and 'ID_PART_ENTRY_NUMBER' in props:
-                dev_hash['grub'] = "%s,%s"%(devicesHash[devParent]['map'],
-                                    props['ID_PART_ENTRY_NUMBER'])
+                dev_hash['grub'] = "%s,%d"%(devicesHash[devParent]['map'],
+                                    int(props['ID_PART_ENTRY_NUMBER'])-1)
             else:
                 dev_hash['grub'] = ""
             disk_hash[devName] = dev_hash