libceph: fix invalid accesses to ceph_connection_v1_info

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SUSE CVE-2025-39880

In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to cephconnectionv1info There is a place where generic code in messenger.c is reading and another place where it is writing to con-v1 union member without checking that the union member is active i.e...