7eabeaed0e
When nested mounts appear under a sysext hierarchy like this: mkdir -p /opt/trigger/ mount -t tmpfs tmpfs /opt/trigger mkdir -p /opt/trigger/inner mount -t tmpfs tmpfs /opt/trigger/inner Then systemd-sysext merge hit an assertion reported in https://github.com/flatcar/Flatcar/issues/2111 because when it iterates over the list of sub mounts it doesn't expect entries with NULL in the path from the dropped entries. Instead of having to deal with entries with path NULL, better sort the holes from dropping to the end and then reduce the array length.
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