vhdx: Check for 4 GB maximum log size on creation
It's unclear what the real maximum is, but we use an uint32_t to store the log size in vhdx_co_create(), so we should check that the given value fits in 32 bits. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com>
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