usbfs stores the wrong signal number in the siginfo structure used for
notifying user programs about device disconnect.  This patch (as726)
fixes it.
From: Zoran Marceta <Zoran.Marceta@micronasnit.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
                wake_up_all(&ds->wait);
                list_del_init(&ds->list);
                if (ds->discsignr) {
-                       sinfo.si_signo = SIGPIPE;
+                       sinfo.si_signo = ds->discsignr;
                        sinfo.si_errno = EPIPE;
                        sinfo.si_code = SI_ASYNCIO;
                        sinfo.si_addr = ds->disccontext;