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block: Handle error of bdrv_getlength in bdrv_create_dirty_bitmap
bdrv_getlength could fail, check the return value before using it. Return NULL and set errno if it fails. Callers are updated to handle the error case. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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