Fix segmentation fault when using feedfile with UDP UC and MC ips on same port.
Fix segmentation fault when using feedfile with UDP UC and MC ips on same port.

Issue description:
Generate feed file with the following two sockets:
U:192.168.1.242:20000
U:224.10.10.1:20000
Where 192.168.1.242 is local IP
Run the following command:
sockperf sr -f feed --threads-num=1

Patch submitted by Firas Hamad, FHamad@asaltech.com

shekkbuilder/sockperf,shekkbuilder/sockperf,shekkbuilder/sockperf,shekkbuilder/sockperf