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Mickaël Salaün a234946deb selftests/landlock: Fix format warning for __u64 in net_test

commit a060ac0b8c upstream.

On architectures where __u64 is unsigned long (e.g. powerpc64), using
%llx to format a __u64 triggers a -Wformat warning because %llx expects
unsigned long long.  Cast the argument to unsigned long long.

Cc: Günther Noack <gnoack@google.com>
Cc: stable@vger.kernel.org
Fixes: a549d055a2 ("selftests/landlock: Add network tests")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202604020206.62zgOTeP-lkp@intel.com/
Reviewed-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20260402192608.1458252-6-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>