core: code shrink in gpiod_simple_get_value()
core: code shrink in gpiod_simple_get_value()

Use one of the request helpers for smaller code.

Signed-off-by: Bartosz Golaszewski <108de5fbc428215dc26df4468b48691526611148@gmail.com>

brgl/libgpiod,brgl/libgpiod,brgl/libgpiod,brgl/libgpiod,clemensg/libgpiod,clemensg/libgpiod