This change addresses the following ASAN error:

```
==1973462==ERROR: AddressSanitizer: heap-use-after-free on address 0x5110002117dc at pc 0x749c307c8a65 bp 0x7ffc3af331d0 sp 0x7ffc3af331c8
READ of size 4 at 0x5110002117dc thread T0
    #0 0x749c307c8a64 in rb_getaddrinfo /tmp/ruby/src/trunk_asan/ext/socket/raddrinfo.c:564:14
    #1 0x749c307c8a64 in rsock_getaddrinfo /tmp/ruby/src/trunk_asan/ext/socket/raddrinfo.c:1008:21
    ruby#2 0x749c307cac48 in rsock_addrinfo /tmp/ruby/src/trunk_asan/ext/socket/raddrinfo.c:1049:12
    ruby#3 0x749c307b10ae in init_inetsock_internal /tmp/ruby/src/trunk_asan/ext/socket/ipsocket.c:62:23
    ruby#4 0x562c5b2e327e in rb_ensure /tmp/ruby/src/trunk_asan/eval.c:1080:18
    ruby#5 0x749c307aafd4 in rsock_init_inetsock /tmp/ruby/src/trunk_asan/ext/socket/ipsocket.c:1318:12
    ruby#6 0x749c307b3b78 in tcp_svr_init /tmp/ruby/src/trunk_asan/ext/socket/tcpserver.c:39:12
```

Fixed to avoid accessing memory that has already been freed after calling `free_getaddrinfo_arg`.