[CentOS] sshd problems

Hello,

For some reason ssh has stopped working.  Its been a good while since I
tried to login remotely so I figure an upgrade is probably to blame as it
was working some time ago.

This is the only error I see when sshd is started:

Oct 28 21:55:52 sshd[7137]: Server listening on :: port 22.
Oct 28 21:55:52 sshd[7137]: error: Bind to port 22 on 0.0.0.0 failed:
Address already in use.

What does this mean?

TIA