tools/firewire: Fix several incorrect format specifiers

Make a minor change to eliminate static checker warnings. Fix several
incorrect format specifiers that misused signed and unsigned versions.

Signed-off-by: Luo Yifan <luoyifan@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20241113023137.291661-1-luoyifan@cmss.chinamobile.com


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