static-checks-include-order.sh: Be sure to run with "set -o pipefail"

Otherwise, any error from the underlying script will be swallowed by
"tee" command.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I38765202b0b629c1cc783aa241619aa407e538f1
diff --git a/script/static-checks/static-checks-include-order.sh b/script/static-checks/static-checks-include-order.sh
index 67089b5..ded10a2 100755
--- a/script/static-checks/static-checks-include-order.sh
+++ b/script/static-checks/static-checks-include-order.sh
@@ -7,6 +7,8 @@
 
 # unittest-include-order.sh <path-to-root-folder> [patch]
 
+set -o pipefail
+
 LOG_FILE=$(mktemp -t include-order-check.XXXX)
 
 if [[ "$2" == "patch" ]]; then