serial: 8250: invert serial8250_register_8250_port() CIR condition

serial: 8250: invert serial8250_register_8250_port() CIR condition

There is no point in a long 'if' in serial8250_register_8250_port() to
just return ENOSPC for PORT_8250_CIR ports. Invert the condition and
return immediately.

'gpios' variable was moved to its set location.

And return ENODEV instead of ENOSPC. The latter is a leftover from the
previous find-uart 'if'. The former makes a lot more sense in this case.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20250611100319.186924-31-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>