Patch for /mysql-backup.sh

```
$MYSQL should be mysql in line 81
```

Original issue reported on code.google.com by `vikrant....@gmail.com` on 23 May 2014 at 8:11

Attachments:
- [mysql-backup.sh.patch](https://storage.googleapis.com/google-code-attachments/mycodedump/issue-1/comment-0/mysql-backup.sh.patch)
