stream: tweak usage of bdrv_co_is_allocated
is_allocated_base has complex semantics that are not really usable outside streaming. Split the check in two parts, where the allocated state for the top bs is moved to the caller. The resulting function is more generally useful. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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