USB: cdc-wdm: fix race between interrupt handler and tasklet

commit 6dd433e6 upstream.

Both could want to submit the same URB. Some checks of the flag
intended to prevent that were missing.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>