selftests: connector: Fix input argument error paths to skip

Fix input argument parsing paths to skip from their error legs.
This fix helps to avoid false test failure reports without running
the test.

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Reviewed-by: Anjali Kulkarni <anjali.k.kulkarni@oracle.com>
Link: https://lore.kernel.org/r/20230729002403.4278-1-skhan@linuxfoundation.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>