Fix referencing to the raid_device var which is not set

Change-Id: I11180e5d61d893a78583ace555f6e90ba8845950

ironic_python_agent/hardware.py

@@ -2917,7 +2917,7 @@ class GenericHardwareManager(HardwareManager):
             except processutils.ProcessExecutionError as e:
                 LOG.warning('Failed to remove superblock from'
                             '%(device)s: %(err)s',
-                            {'device': raid_device.name, 'err': e})
+                            {'device': blk.name, 'err': e})
 
         # Erase all partition tables we created
         all_holder_disks_uniq = list(

releasenotes/notes/fix-raid_device-not-set-8b03688ce83ce22e.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixes referencing to raid_device variable before assignment,
+    is replaced by blk variable.