293c293
< * list. Return free block frame. May return NULL if there are
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> * list. Return free block frame. May return nullptr if there are
467c467
< * cpu_pkt (NULL if none).
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> * cpu_pkt (nullptr if none).
470c470
< * @return A new Packet containing the request, or NULL if the
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> * @return A new Packet containing the request, or nullptr if the