Add some error checking to pcap_dump(). #494

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We noticed that pcap files were corrupted after a full disk event. This patch tries to help a bit.

Note that probably it would be better if pcap_dump() returned an error code, rather than being a void function. The best way to transition to that might be to add a new function that returned an error, and had pcap_dump() just call that and throw away the error code, then declare pcap_dump() deprecated in a future version of the ABI and ultimately removing it.

Who thought a function that doesn't return an error code was a good idea? 馃槈

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