usb: gadget: function: fix typo in f_printer.c

In line 824, it is trying to enable `out_ep`, so I
believe that in line 826, it should print `out_ep`
instead of `in_ep`.

Signed-off-by: Wei Ming Chen <jj251510319013@gmail.com>
Link: https://lore.kernel.org/r/20210214121929.9750-1-jj251510319013@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>