UBI updates for 2025.10
- ubi fixes found by Andrew with Smatch
- mtd: ubi: Remove test that always fails
- fs: ubifs: Ensure buf is freed before return
- fs: ubifs: Need to check return for being an error pointer
-fs: ubifs: Fix and rework error handling in ubifs_finddir
- fix: limit copy size in ubispl found by Benedikt
- extend support for LED activity (use the LED activity also on ubi reads)
from Yegor
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