block: Fix bdrv_is_allocated() for short backing files
bdrv_is_allocated() shouldn't return true for sectors that are unallocated, but after the end of a short backing file, even though such sectors are (correctly) marked as containing zeros. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com>
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