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fix: bound num_ref_frames_in_pic_order_cnt_cycle in AVC SPS parsing

An out-of-range num_ref_frames_in_pic_order_cnt_cycle was used directly to
size a slice, so a tiny malformed SPS NAL unit could make ParseSPSNALUnit
allocate multiple gigabytes. Reject values outside the spec range 0-255
(ISO/IEC 14496-10 7.4.2.1.1) before allocating.