btrfs: do not allow relocation of partially dropped subvolumes

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CVE-2025-39738

In the Linux kernel, the following vulnerability has been resolved: btrfs: do not allow relocation of partially dropped subvolumes BUG There is an internal report that balance triggered transaction abort, with the following call trace: item 85 key 594509824 169 0 itemoff 12599 itemsize 33 extent...