staging: fbtft: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

The function fbtft_driver_remove_pdev() (that exists several times as it's
part of a macro expansion) returns zero unconditionally, so it can be
trivially converted to return void without semantic changes.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231026214407.2508590-2-u.kleine-koenig@pengutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fbtft/fbtft.h

@@ -310,12 +310,11 @@ static int fbtft_driver_probe_pdev(struct platform_device *pdev)           \
 	return fbtft_probe_common(_display, NULL, pdev);                   \
 }                                                                          \
 									   \
-static int fbtft_driver_remove_pdev(struct platform_device *pdev)          \
+static void fbtft_driver_remove_pdev(struct platform_device *pdev)	   \
 {                                                                          \
 	struct fb_info *info = platform_get_drvdata(pdev);                 \
 									   \
 	fbtft_remove_common(&pdev->dev, info);                             \
-	return 0;                                                          \
 }                                                                          \
 									   \
 FBTFT_DT_TABLE(_compatible)						   \
@@ -329,7 +328,7 @@ static struct platform_driver fbtft_driver_platform_driver = {             \
 		.of_match_table = dt_ids,                                  \
 	},                                                                 \
 	.probe  = fbtft_driver_probe_pdev,                                 \
-	.remove = fbtft_driver_remove_pdev,                                \
+	.remove_new = fbtft_driver_remove_pdev,				   \
 };                                                                         \
 									   \
 static int __init fbtft_driver_module_init(void)                           \