[PATCH] USB: make pdfdocs problem

	The `make pdfdocs' target still fails for me on the
`writing_usb_drivers' document.  There's one small bug in it, and one
problem I haven't figured out yet.

	There is a malformed <literal>blah<literal> sequence, where the
closing tag is instead an opening tag.  Patch for that below.

Documentation/DocBook/writing_usb_driver.tmpl

@@ -209,7 +209,7 @@ static int skel_probe(struct usb_interface *interface,
      The driver now needs to verify that this device is actually one that it
      can accept. If so, it returns 0.
      If not, or if any error occurs during initialization, an errorcode
-     (such as <literal>-ENOMEM<literal> or <literal>-ENODEV<literal>)
+     (such as <literal>-ENOMEM</literal> or <literal>-ENODEV</literal>)
      is returned from the probe function.
   </para>
   <para>