gpiolib: remove an unnecessary TODO

It's actually fine to read values of output lines. This was also
allowed by the legacy sysfs interface.

Signed-off-by: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpiolib.c

···
 	int i;
 
 	if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
-		/* TODO: check if descriptors are really input */
+		/* NOTE: It's ok to read values of output lines. */
 		int ret = gpiod_get_array_value_complex(false,
 							true,
 							lh->numdescs,