Fix string formatting in Jenkinsfile

The string formatting in the Jenkinsfile during the post of the
checks was broken. Groovy did not accept the operator in a hanging
line.

Change-Id: Ica7e6e9dedde31ca90888e4288975f4a1e6e7a07
diff --git a/Jenkinsfile b/Jenkinsfile
index d6ff0df..260a61c 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -98,8 +98,8 @@
             contentType: 'APPLICATION_JSON', requestBody: json,
             validResponseCodes: '200', url: gerritPostUrl)
         echo "----------------------------------------------------------------------------"
-        echo "Gerrit Check: ${check.uuid}=" + check.build.result + " to change "
-            + check.changeNum + "/" + check.sha1
+        echo "Gerrit Check: ${check.uuid}=" + check.build.result + " to change " +
+            check.changeNum + "/" + check.sha1
         echo "----------------------------------------------------------------------------"
     } catch(Exception e) {
         echo "ERROR> Failed to post check results to Gerrit: ${e}"