Don't return None on mismatched interactive passwords

This will cause the command to continue with no password set
at all which is not what we want.

We want to loop forever until the passwords match or the
user gives up and types ^D or ^C.

https://pagure.io/freeipa/issue/7383

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipalib/cli.py

@@ -627,7 +627,6 @@ class textui(backend.Backend):
                     return pw1
                 else:
                     self.print_error(_('Passwords do not match!'))
-                    return None
         else:
             return self.decode(sys.stdin.readline().strip())