tty: cleanup tty_chars_in_buffer

There is no need for 'else' when the 'if' part already returned. This
makes tty_chars_in_buffer similar to tty_write_room too.
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210302062214.29627-42-jslaby@suse.czSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_ioctl.c

@@ -57,8 +57,7 @@ int tty_chars_in_buffer(struct tty_struct *tty)
 {
 	if (tty->ops->chars_in_buffer)
 		return tty->ops->chars_in_buffer(tty);
-	else
-		return 0;
+	return 0;
 }
 EXPORT_SYMBOL(tty_chars_in_buffer);