Description of problem:
Entering identical printer and fax names in hp-setup permanently disables the "Add Printer" button (until the wizard is restarted).

Version-Release number of selected component (if applicable):
3.10.9-5.fc14

How reproducible:
Always

Steps to Reproduce:
1. Start hp-setup.
2. At wizard step 1, select the Network connection type.
3. At step 2, select a printer with fax support (in my case, an M2727nf).
4. At step 3, enter a value in the "Printer name" field.
5. Enter the *same* value in the "Fax name" field, then type an additional
character so that the printer and fax names are no longer identical.

Actual results:
The "Add Printer" button is disabled when the printer and fax names are equal and is not re-enabled when the fax name is subsequently changed.

Expected results:
The "Add Printer" button is re-enabled when the fax name is changed.

Additional info:
Triggered by a configuration where the fax name is "<printername>-fax".