[PATCH] fbdev: atafb: fix sparse warnings

[Helge Deller <deller@gmx.de>]

Fix two sparse warnings:
- atafb.c:1092: sparse: Using plain integer as NULL pointer

Use NULL instead of 0 when assigning a pointer.

- atafb.c:2824: sparse: switch with no cases

FBCMD_GET_CURRENTPAR and and FBCMD_SET_CURRENTPAR seem to be
historic defines, which are not any longer in the kernel, and
as such the code isn't built any longer and may be dropped.

Fixes: d463633d63e6 ("fbdev: atafb: Add support for SuperVidel's SuperBlitter")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202609261313.kgFtkz2t-lkp@intel.com/
Cc: Miro Kropacek <miro.kropacek@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
---
 drivers/video/fbdev/atafb.c | 26 +-------------------------
 1 file changed, 1 insertion(+), 25 deletions(-)

diff --git a/drivers/video/fbdev/atafb.c b/drivers/video/fbdev/atafb.c
index c3011b61a94b..5c3e5861543a 100644
--- a/drivers/video/fbdev/atafb.c
+++ b/drivers/video/fbdev/atafb.c
@@ -1089,7 +1089,7 @@ static int falcon_decode_var(struct fb_info *info, struct fb_var_screeninfo *var
 			/* Choose largest pixelclock <= wanted clock */
 			int i;
 			unsigned long pcl = ULONG_MAX;
-			pclock = 0;
+			pclock = NULL;
 			for (i = 1; i <= 4; i *= 2) {
 				if (f25.t * i >= var->pixclock &&
 				    f25.t * i < pcl) {
@@ -2818,29 +2818,6 @@ static void atafb_imageblit(struct fb_info *info, const struct fb_image *image)
 	}
 }
 
-static int
-atafb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
-{
-	switch (cmd) {
-#ifdef FBCMD_GET_CURRENTPAR
-	case FBCMD_GET_CURRENTPAR:
-		if (copy_to_user((void *)arg, &current_par,
-				 sizeof(struct atafb_par)))
-			return -EFAULT;
-		return 0;
-#endif
-#ifdef FBCMD_SET_CURRENTPAR
-	case FBCMD_SET_CURRENTPAR:
-		if (copy_from_user(&current_par, (void *)arg,
-				   sizeof(struct atafb_par)))
-			return -EFAULT;
-		ata_set_par(&current_par);
-		return 0;
-#endif
-	}
-	return -EINVAL;
-}
-
 /* (un)blank/poweroff
  * 0 = unblank
  * 1 = blank
@@ -2922,7 +2899,6 @@ static struct fb_ops atafb_ops = {
 	.fb_fillrect	= atafb_fillrect,
 	.fb_copyarea	= atafb_copyarea,
 	.fb_imageblit	= atafb_imageblit,
-	.fb_ioctl =	atafb_ioctl,
 	__FB_DEFAULT_IOMEM_OPS_MMAP,
 };
 
-- 
2.55.0