Input: fix open count handling in input interfaces

patch 06445014 in mainline.

If input_open_device() fails we should not leave interfaces marked
as opened.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>