Werk #19718: omd umount: Fix wrong exit code when run over all sites

Component	Site management
Title	omd umount: Fix wrong exit code when run over all sites
Date	Aug 5, 2026
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	3.0.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p11 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p36 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.3.0p50 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

If one invoked omd umount without specifying a site, the tool would report 1 if it succeeded and 0 if it failed. This regression was introduced along-side #18890.

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