Endless pcap_stats + patch

[Max Laier <max () love2party net>]

Hi,

this problem was reported by Giorgos Keramidas as a FreeBSD PR.

When dumpping from a file (-r) hitting ^T (sending SIGINFO) results in an 
endless stream of "pcap_stats: Statistics aren't available from 
savefiles".  The attached patch should fix this and other possible error 
cases of pcap_stats.

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