normal/misc: Close device on all pathes.

Found by: Coverity scan.

grub-core/normal/misc.c

@@ -184,10 +184,11 @@ grub_normal_print_device_info (const char *name)
 		     /* TRANSLATORS: Replace dot with appropriate decimal separator for
 			your language.  */
 		     (grub_disk_get_size (dev->disk) & 1) ? _(".5") : "");
-
-      grub_device_close (dev);
     }
 
+  if (dev)
+    grub_device_close (dev);
+
   grub_xputs ("\n");
   return grub_errno;
 }