Werk #14708: fileinfo: Fix crash with negative file age

Component	Checks & agents
Title	fileinfo: Fix crash with negative file age
Date	Dec 16, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p19 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Previously, fileinfo and fileinfo group services would crash if the file's creation timestamp was from the future.

Now, the service state is UNKNOWN and there is a message indicating the problem.

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