Fix hakapcap segv with an invalid pcap file
Fix hakapcap segv with an invalid pcap file

When the pcap file does not exist (ie. 'hakapcap ddd ddd') the process
segfaulted.

haka-security/haka,nabilbendafi/haka,haka-security/haka,LubyRuffy/haka,LubyRuffy/haka,lcheylus/haka,Wingless-Archangel/haka,nabilbendafi/haka,haka-security/haka,lcheylus/haka,nabilbendafi/haka,Wingless-Archangel/haka,lcheylus/haka