tty: audit: unify to u8

Somewhere, we use 'char', somewhere 'unsigned char'. Unify to 'u8' as
the rest of the tty layer does.

Signed-off-by: "Jiri Slaby (SUSE)" <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/tty.h

···
 #ifdef CONFIG_AUDIT
 void tty_audit_add_data(const struct tty_struct *tty, const void *data,
 			size_t size);
-void tty_audit_tiocsti(const struct tty_struct *tty, char ch);
+void tty_audit_tiocsti(const struct tty_struct *tty, u8 ch);
 #else
 static inline void tty_audit_add_data(const struct tty_struct *tty,
 				      const void *data, size_t size)
 {
 }
-static inline void tty_audit_tiocsti(const struct tty_struct *tty, char ch)
+static inline void tty_audit_tiocsti(const struct tty_struct *tty, u8 ch)
 {
 }
 #endif

drivers/tty/tty_audit.c

···
 	dev_t dev;		/* The TTY which the data is from */
 	bool icanon;
 	size_t valid;
-	unsigned char *data;	/* Allocated size N_TTY_BUF_SIZE */
+	u8 *data;		/* Allocated size N_TTY_BUF_SIZE */
 };
 
 static struct tty_audit_buf *tty_audit_buf_ref(void)
···
 }
 
 static void tty_audit_log(const char *description, dev_t dev,
-			  const unsigned char *data, size_t size)
+			  const u8 *data, size_t size)
 {
 	struct audit_buffer *ab;
 	pid_t pid = task_pid_nr(current);
···
 /*
  *	tty_audit_tiocsti	-	Log TIOCSTI
  */
-void tty_audit_tiocsti(const struct tty_struct *tty, char ch)
+void tty_audit_tiocsti(const struct tty_struct *tty, u8 ch)
 {
 	dev_t dev;