ynl: samples: Fix the wrong format specifier

Make a minor change to eliminate a static checker warning. The type
of s->ifc is unsigned int, so the correct format specifier should be
%u instead of %d.

Signed-off-by: Luo Yifan <luoyifan@cmss.chinamobile.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241113011142.290474-1-luoyifan@cmss.chinamobile.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>