adcc805929
This makes sure the the codepath that derives an nsfd from a pid works the same for the pidfd case and the non-pidfd case: if we can verify that /proc/ is mounted but the /proc/$PID/ns/ files are missing, we can assume the ns type is not supported by the kernel. Hence return the same ENOPKG error in this case as we already do in the pidfd ioctl based codepath.
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