test(vsock): Do not exit with 255 in remote bash script

Exit code 255 is already used by the SSH client to communicate
connection errors [1], meaning if the remote command also exits with 255
in failure cases, this will be indistinguishable from a connection
error. Use exit code 1 instead in `check_guest_connections`.

[1]: https://man.openbsd.org/ssh#EXIT_STATUS

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/framework/utils_vsock.py

@@ -180,7 +180,7 @@ def check_guest_connections(vm, server_port_path, blob_path, blob_hash):
     cmd += "  ({})& ".format(worker_cmd)
     cmd += '  workers="$workers $!";'
     cmd += "done;"
-    cmd += "for w in $workers; do wait $w || exit -1; done"
+    cmd += "for w in $workers; do wait $w || exit 1; done"
 
     ecode, _, stderr = vm.ssh.run(cmd)
     echo_server.terminate()