get_ref_frame: fix test for valid buffer.
In the current implementation of the encoder, frame buffers may come from the wider set of 12 such buffers, and is not restricted to the 8 allowed as reference frames. This is only an implementation detail and does not affect the constraint of having a total of 8 reference buffers overall. Change-Id: I075f777146c2df49c275d89232933f8127235175
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