Only add strerro if errno != 0

src/connector.c

@@ -204,8 +204,8 @@ retry:
 		/* We should have something to read if called since poll set
 		 * this fd's revents status so if there's nothing it means the
 		 * client has disconnected. */
-		LOGINFO("Client fd %d disconnected with ret %d errno %d: %s", client->fd,
-			ret, errno, strerror(errno));
+		LOGINFO("Client fd %d disconnected with ret %d errno %d %s", client->fd,
+			ret, errno, errno ? strerror(errno) : "");
 		invalidate_client(ckp, ci, client);
 		return;
 	}