drbd: fix null-pointer dereference on local read error

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AZL-66824 CVE-2025-38708 affecting package kernel for versions less than 6.6.104.2-1

In the Linux kernel, the following vulnerability has been resolved: drbd: add missing krefget in handlewriteconflicts With two-primaries enabled, DRBD tries to detect "concurrent" writes and handle write conflicts, so that even if you write to the same sector simultaneously on both nodes, they en...