Correct one debug log, which wrongly mixed address and port.
Before:
```
ripd[469497]: [NDAGH-Z85V7] rip_send_packet 3.3.3.4 > 224.0.0.9 (enp1s0)
ripd[469497]: [VEJY5-67P5X] SEND to 224.0.0.9520
```
After:
```
ripd[471330]: [NDAGH-Z85V7] rip_send_packet 3.3.3.4 > 224.0.0.9 (enp1s0)
ripd[471330]: [T8DFR-P09JH] SEND to 224.0.0.9 port 520
```
Signed-off-by: anlan_cs <vic.lan@pica8.com>
ret = sendmsg(rip->sock, &msg, 0);
if (IS_RIP_DEBUG_EVENT)
- zlog_debug("SEND to %pI4%d", &sin.sin_addr,
+ zlog_debug("SEND to %pI4 port %d", &sin.sin_addr,
ntohs(sin.sin_port));
if (ret < 0)