Otherwise, if already 'remove' uevent for the device is queued, then
the device node may not exist any more when 'udevadm wait' command succeeds.
Follow-up for
90941d458a2f6b03cb782ab55c16f605b44c4fd8.
# the generic one we must mount by hand
mkdir -p /tmp/validatefs-test.mount/somewhere/else
-udevadm wait --timeout=30 /dev/disk/by-label/qnurx
+udevadm wait --settle --timeout=30 /dev/disk/by-label/qnurx
mount /dev/disk/by-label/qnurx /tmp/validatefs-test.mount/somewhere/else
getfattr --dump /tmp/validatefs-test.mount/somewhere/else