Don't leak memory if an invalid type is set (redis#906)

Co-authored-by: James Rouzier <jrouzier@inverse.ca>

hiredis.c

@@ -835,7 +835,7 @@ redisContext *redisConnectWithOptions(const redisOptions *options) {
         c->fd = options->endpoint.fd;
         c->flags |= REDIS_CONNECTED;
     } else {
-        // Unknown type - FIXME - FREE
+        redisFree(c);
         return NULL;
     }