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由 Jeff Cody 提交于
If bdrv_unref() is passed a NULL BDS pointer, it is safe to exit with no operation. This will allow cleanup code to blindly call bdrv_unref() on a BDS that has been initialized to NULL. Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NJeff Cody <jcody@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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