[WATCHDOG] use ENOTTY instead of ENOIOCTLCMD in ioctl()

Return ENOTTY instead of ENOIOCTLCMD in user-visible ioctl() results

The watchdog drivers used to return ENOIOCTLCMD for bad ioctl() commands.
ENOIOCTLCMD should not be visible by the user, so use ENOTTY instead.

Signed-off-by: Samuel Tardieu <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
Acked-by: Alan Cox <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Wim Van Sebroeck

drivers/char/watchdog/iTCO_wdt.c

@@ -494,7 +494,7 @@ static int iTCO_wdt_ioctl (struct inode *inode, struct file *file,
 		}
 
 		default:
-			return -ENOIOCTLCMD;
+			return -ENOTTY;
 	}
 }
 

drivers/char/watchdog/pnx4008_wdt.c

@@ -184,7 +184,7 @@ static int
 pnx4008_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 		  unsigned long arg)
 {
-	int ret = -ENOIOCTLCMD;
+	int ret = -ENOTTY;
 	int time;
 
 	switch (cmd) {