alpine-amd64-node10-tf-a: remove semi-colon

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Change-Id: Ib7faf04e66c063dc54c5b6a8e10946834dc70bd0
diff --git a/alpine-amd64-node10-tf-a/Dockerfile b/alpine-amd64-node10-tf-a/Dockerfile
index 693a100..2408dea 100644
--- a/alpine-amd64-node10-tf-a/Dockerfile
+++ b/alpine-amd64-node10-tf-a/Dockerfile
@@ -8,7 +8,7 @@
     # Setup buildslave user for Jenkins ;\
     adduser buildslave -D -s /bin/bash ;\
     echo 'buildslave ALL = NOPASSWD: ALL' > /etc/sudoers.d/jenkins ;\
-    chmod 0440 /etc/sudoers.d/jenkins ;\
+    chmod 0440 /etc/sudoers.d/jenkins
 
 USER buildslave