tty: Fix compilation warrning

 | tty.c: In function ‘tty_restore_ctl_terminal’:
 | include/criu-log.h:42:16: error: ‘index’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

Same time assign CONSOLE_INDEX for debug info.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

tty.c

@@ -486,7 +486,7 @@ static int tty_restore_ctl_terminal(struct file_desc *d, int fd)
 {
 	struct tty_info *info = container_of(d, struct tty_info, d);
 	struct reg_file_info *fake = NULL;
-	int slave = -1, ret = -1, index;
+	int slave = -1, ret = -1, index = -1;
 
 	if (!is_service_fd(fd, CTL_TTY_OFF))
 		return 0;
@@ -503,7 +503,7 @@ static int tty_restore_ctl_terminal(struct file_desc *d, int fd)
 		}
 	} else if (info->type == TTY_TYPE_CONSOLE) {
 		slave = open_pty_reg(info->reg_d, O_RDONLY);
-		index = -1;
+		index = CONSOLE_INDEX;
 		if (slave < 0) {
 			pr_perror("Can't open %s", path_from_reg(info->reg_d));
 			goto err;