kselftest: missing arg in ptrace.c

The string passed to ksft_test_result_skip is missing the `type_name`

Signed-off-by: Remington Brasga <rbrasga@uci.edu>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20240712231730.2794-1-rbrasga@uci.edu


Signed-off-by: Will Deacon <will@kernel.org>