jsnbd: Disable command tracing in state hook script

Enabling 'set -x' can be useful for debugging, but as default behavior
it's basically just noise.  Thus far that noise hasn't ended up anywhere
visible because nbd-proxy redirects stderr to /dev/null when running
this script, but that may soon be changing so that actual error messages
from the script aren't lost.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: Idc7d0d3fd54fd9349bf39f47c3e62a89d98b5d03
diff --git a/meta-phosphor/recipes-connectivity/jsnbd/jsnbd/state_hook b/meta-phosphor/recipes-connectivity/jsnbd/jsnbd/state_hook
index 5831e94..5b5aea1 100755
--- a/meta-phosphor/recipes-connectivity/jsnbd/jsnbd/state_hook
+++ b/meta-phosphor/recipes-connectivity/jsnbd/jsnbd/state_hook
@@ -25,7 +25,7 @@
     ;;
 esac
 
-set -ex
+set -e
 
 GADGET_BASE=/sys/kernel/config/usb_gadget