btrfs-progs: Adjust timing of safety delay countdown

When printing the countdown in the safety delay, the number should
correspond to the number of seconds remaining to wait at the time the
delay is printed.

In other words, there should be a one second sleep after printing '1'.

Signed-off-by: Noah Massey <noah.massey@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>

cmds-balance.c

@@ -445,9 +445,9 @@ static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
 		printf("\twarning. The operation will start in %d seconds.\n", delay);
 		printf("\tUse Ctrl-C to stop it.\n");
 		while (delay) {
-			sleep(1);
 			printf("%2d", delay--);
 			fflush(stdout);
+			sleep(1);
 		}
 		printf("\nStarting balance without any filters.\n");
 	}