gpio: winbond: Fix error code in winbond_gpio_get()

This error path returns 1, but it should instead propagate the negative
error code from winbond_sio_enter().

Fixes: a0d65009

 ("gpio: winbond: Add driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>