daemon: Print device names when they are translated.

This helps to debug problems with the new device name translation
code.  We can think about removing this later when the code is known
to work well.

daemon/device-name-translation.c

@@ -191,6 +191,10 @@ device_name_translation (const char *device)
       return NULL;
   }
 
+  /* If the device name is different, print the translation. */
+  if (STRNEQ (device, ret))
+    fprintf (stderr, "device name translated: %s -> %s\n", device, ret);
+
   /* Now check the device is openable. */
   fd = open (ret, O_RDONLY|O_CLOEXEC);
   if (fd >= 0) {
@@ -277,5 +281,9 @@ reverse_device_name_translation (const char *device)
     }
   }
 
+  /* If the device name is different, print the translation. */
+  if (STRNEQ (device, ret))
+    fprintf (stderr, "reverse device name translated: %s -> %s\n", device, ret);
+
   return ret;
 }