Robert Watson fa0c2b3474 Check for a NULL free buffer pointer in BPF before invoking
bpf_canfreebuf() in order to avoid potentially calling a non-inlinable
but trivial function in zero-copy buffer mode for every packet
received when we couldn't free the buffer anyway.

MFC after:	4 months
2008-03-25 07:41:33 +00:00
..
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2008-01-15 18:34:47 +00:00
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