CID 486327: Control flow issues (UNREACHABLE)

Just need to be removed.

** CID 486327:  Control flow issues  (UNREACHABLE)
/lib/isc/netmgr/netmgr.c: 750 in isc___nmsocket_init()


________________________________________________________________________________________________________
*** CID 486327:  Control flow issues  (UNREACHABLE)
/lib/isc/netmgr/netmgr.c: 750 in isc___nmsocket_init()
744     			sock->statsindex = tcp6statsindex;
745     			break;
746     		default:
747     			UNREACHABLE();
748     		}
749     		break;
   CID 486327:  Control flow issues  (UNREACHABLE)
   This code cannot be reached: "switch (family) {
 case 2:...".
750     		switch (family) {
751     		case AF_INET:
752     			sock->statsindex = tcp4statsindex;
753     			break;
754     		case AF_INET6:
755     			sock->statsindex = tcp6statsindex;