server read check relies on boolean short circuiting

[CardboardBread]

in chopserver.c:98:
if (client != NULL && FD_ISSET(client->socket_fd, &listen_fds)) {
conventionally, the statement could segfault if the right side is evaluated before the left, but since the left side is (assumedly) evaluated first the program can immediately return the conditional when it's false.

A suggested change is:
if (client != NULL) {
if (FD_ISSET(client->socket_fd, &listen_fds)) {