ceph: fix memory leak in ceph_direct_read_write()

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SUSE CVE-2024-56710

In the Linux kernel, the following vulnerability has been resolved: ceph: fix memory leak in cephdirectreadwrite The bvecs array which is allocated in itergetbvecsalloc is leaked and pages remain pinned if cephallocsparseextmap fails. There is no need to delay the allocation of sparseext map unti...