firewire: ohci: move self_id_complete tracepoint after validating register

The value of OHCI1394_SelfIDCount register includes an error-indicating
bit. It is safer to place the tracepoint probe after validating the
register value.

Link: https://lore.kernel.org/r/20250823030954.268412-2-o-takashi@sakamocchi.jp


Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>