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 <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/net/ynl/samples/page-pool.c

···
 			name = if_indextoname(s->ifc, ifname);
 			if (name)
 				printf("%8s", name);
-			printf("[%d]\t", s->ifc);
+			printf("[%u]\t", s->ifc);
 		}
 
 		printf("page pools: %u (zombies: %u)\n",