[sr-dev] [kamailio/kamailio] Build warnings (#2636)

**core/receive.c:300 - CentOS 7** ``` CC (gcc) [kamailio] core/ip_addr.o CC (gcc) [kamailio] core/rvalue.o CC (gcc) [kamailio] core/receive.o core/receive.c: In function 'receive_msg': core/receive.c:300:2: warning: missing braces around initializer [-Wmissing-braces] sr_net_info_t netinfo = {0}; ^ core/receive.c:300:2: warning: (near initialization for 'netinfo.data') [-Wmissing-braces] CC (gcc) [kamailio] core/timer_proc.o CC (gcc) [kamailio] core/lock_ops.o CC (gcc) [kamailio] core/counters.o ```