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-rw-r--r--progs/xdemos/corender.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/progs/xdemos/corender.c b/progs/xdemos/corender.c
index ca8ee1eed33..8c705354829 100644
--- a/progs/xdemos/corender.c
+++ b/progs/xdemos/corender.c
@@ -55,6 +55,7 @@ setup_ipc(void)
printf("Waiting for connection from another 'corender'\n");
Sock = AcceptConnection(k);
+ assert(Sock != -1);
printf("Got connection, sending windowID\n");