Bug#211519: Minor typo on ssh-add.c

[David Dorgan <davidd@sponge.xevion.net>]

Package: ssh
Version: 3.4p1-1.woody.2

When you type ssh-add -h , among the output you get 
  -x          Lock agent.
  -x          Unlock agent.

The unlock should be -X.

in ssh-add.c

293c293
<       fprintf(stderr, "  -X          Unlock agent.\n");
---
>       fprintf(stderr, "  -x          Unlock agent.\n");


David.