bgpd: Free memory allocated by info_make() when hitting maximum-prefix

bgpd: Free memory allocated by info_make() when hitting maximum-prefix

```
Direct leak of 112 byte(s) in 1 object(s) allocated from:
    0 0x7feb66337a06 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:153
    1 0x7feb660cbcc3 in qcalloc lib/memory.c:116
    2 0x55cc3cba02d1 in info_make bgpd/bgp_route.c:3831
    3 0x55cc3cbab4f1 in bgp_update bgpd/bgp_route.c:4733
    4 0x55cc3cbb0620 in bgp_nlri_parse_ip bgpd/bgp_route.c:6111
    5 0x55cc3cb79473 in bgp_update_receive bgpd/bgp_packet.c:2020
    6 0x55cc3cb7c34a in bgp_process_packet bgpd/bgp_packet.c:2929
    7 0x7feb6610ecc5 in thread_call lib/thread.c:2006
    8 0x7feb660bfb77 in frr_run lib/libfrr.c:1198
    9 0x55cc3cb17232 in main bgpd/bgp_main.c:520
    10 0x7feb65ae5082 in __libc_start_main ../csu/libc-start.c:308

SUMMARY: AddressSanitizer: 112 byte(s) leaked in 1 allocation(s).
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>