gpio: ge: Fix build warning

Casting a pointer to u16 can produce a compiler warning such as this:

    drivers/gpio/gpio-ge.c: In function 'gef_gpio_probe':
    drivers/gpio/gpio-ge.c:83:14: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        gc->ngpio = (u16)of_device_get_match_data(&pdev->dev);
                    ^

Cast the pointer through a uintptr_t to avoid the warning.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-ge.c

@@ -80,7 +80,7 @@ static int __init gef_gpio_probe(struct platform_device *pdev)
 	}
 
 	gc->base = -1;
-	gc->ngpio = (u16)of_device_get_match_data(&pdev->dev);
+	gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev);
 	gc->of_gpio_n_cells = 2;
 	gc->of_node = pdev->dev.of_node;