knownhosts: Fix and infinite loop when iterating known host entries

Fixes #145

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>

src/knownhosts.c

@@ -591,6 +591,8 @@ char *ssh_known_hosts_get_algorithms_names(ssh_session session)
         entry = ssh_iterator_value(struct ssh_knownhosts_entry *, it);
         algo = ssh_known_host_sigs_from_hostkey_type(entry->publickey->type);
         if (algo == NULL) {
+            ssh_knownhosts_entry_free(entry);
+            ssh_list_remove(entry_list, it);
             continue;
         }