fold-security-update-branches: Exit on error

To avoid continuing running commands in case of an error abort the
execution immediately.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

release-scripts/fold-security-update-branches

@@ -3,7 +3,7 @@
 ## INFO
 # Script should be run from the apertis-infrastructure/release-scripts
 
-set +e
+set -e
 
 BASEDIR=`dirname $0`