pid1: don't choke on overly long device paths
This mimics what we do for device units: if there's a device we cannot synthesize a good swap unit name for, then proceed without failure. (cherry picked from commit e82c6e8b)
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This mimics what we do for device units: if there's a device we cannot synthesize a good swap unit name for, then proceed without failure. (cherry picked from commit e82c6e8b)