qcow2: Return 0/-errno in qcow2_alloc_cluster_offset
Returning 0/-errno allows it to distingush different errors classes. The cluster offset of newly allocated clusters is now returned in the QCowL2Meta struct. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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