kas-docker: Fix SSH_DIR check

We were missing a closing brace, and the line became rather long as well.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

kas-docker

@@ -147,7 +147,10 @@ DOCKER_ARGS="-v ${REPO_DIR}:/repo:ro \
 	     -e USER_ID=$(id -u) -e GROUP_ID=$(id -g) --rm"
 
 if [ -n "${SSH_DIR}" ] ; then
-	[ -d "${SSH_DIR}" ] || echo "Passed SSH_VALUE '${SSH_DIR}' is not a directory" ; exit 1
+	if [ ! -d "${SSH_DIR}" ]; then
+		echo "Passed SSH_VALUE '${SSH_DIR}' is not a directory"
+		exit 1
+	fi
 	DOCKER_ARGS="${DOCKER_ARGS} -v $(readlink -f ${SSH_DIR}):/etc/skel/.ssh:ro"
 fi