[PATCH] tty: define hung_up_tty_compat_ioctl with CONFIG_COMPAT

[Tom Rix]

gcc reports
drivers/tty/tty_io.c:446:13: error: ‘hung_up_tty_compat_ioctl’
  defined but not used [-Werror=unused-function]
  446 | static long hung_up_tty_compat_ioctl(struct file *file,
      |             ^~~~~~~~~~~~~~~~~~~~~~~~

hung_up_tty_compat_ioctl is used conditionally with CONFIG_COMPAT,
so it should be likewise defined.

Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
---
 drivers/tty/tty_io.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 553182753098..7fe404d56ce7 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -443,11 +443,13 @@ static long hung_up_tty_ioctl(struct file *file, unsigned int cmd,
 	return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
 }
 
+#ifdef CONFIG_COMPAT
 static long hung_up_tty_compat_ioctl(struct file *file,
 				     unsigned int cmd, unsigned long arg)
 {
 	return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
 }
+#endif
 
 static int hung_up_tty_fasync(int fd, struct file *file, int on)
 {
-- 
2.27.0