clone.sh: Run with "set -e" to fail-fast jobs in case of error

Fixes TFC-352.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I76c3ea22db1579fe32b7025e6392c0f3ce4852a2
diff --git a/clone.sh b/clone.sh
index 0d3617b..b5b93a5 100755
--- a/clone.sh
+++ b/clone.sh
@@ -27,6 +27,8 @@
 # is triggered manually from the buider job itself.
 #
 
+set -e
+
 # Global defaults
 GIT_CLONE_PARAMS="--no-checkout"