[sr-dev] [kamailio/kamailio] keepalive.list crash (#2618)

[juha-h]

For some reason destination list is allocated with one uninitialized  item already in it:
```
int ka_alloc_destinations_list()
{
	if(ka_destinations_list != NULL) {
		LM_DBG("ka_destinations_list already allocated\n");
		return 1;
	}

	ka_destinations_list = (ka_destinations_list_t *)shm_malloc(
			sizeof(ka_destinations_list_t));
```
It may be the source of trouble when keepalive_rpc_list tries to list it:
```
static void keepalive_rpc_list(rpc_t *rpc, void *ctx)
{
	void *sub;
	ka_dest_t *dest;
	char t_buf[26] = {0};

	for(dest = ka_destinations_list->first; dest != NULL; dest = dest->next) {
```



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