src: fix crash after when system sleep

After Suspend-to-RAM, io_uring wait returns error EINTR.

Test with below command
$ echo mem > /sys/power/state

see: https://www.kernel.org/doc/html/v4.18/admin-guide/pm/sleep-states.html

src/main.c

@@ -420,9 +420,13 @@ main(void)
   wait:
     error = io_uring_wait_cqe(&ring, &cqe);
     if (error) {
-      if (errno == EAGAIN)
+      error *= -1;
+      if (error == EAGAIN || error == EINTR)
         goto wait;
       fatal("io_uring\n");
+#if GAMEPAD_IDLE_INHIBIT_DEBUG
+      printf("errno: %d %s\n", -error, strerror(-error));
+#endif
       error_code = GAMEPAD_ERROR_IO_URING_WAIT;
       break;
     }