Fixed typo in Docker mirror images pipeline

Change-Id: I94bec1a338678689f54585fc3fafdab1fd86e090
diff --git a/docker-mirror-images.groovy b/docker-mirror-images.groovy
index 8867875..8f0373c 100644
--- a/docker-mirror-images.groovy
+++ b/docker-mirror-images.groovy
@@ -40,7 +40,7 @@
                 imageArray = image.trim().tokenize(' ')
                 imagePath = imageArray[0]
                 targetRegistry = imageArray[1]
-                imageName = getImageName(image)
+                imageName = getImageName(imagePath)
                 sh """docker pull ${imagePath}
                       docker tag ${imagePath} ${targetRegistry}/${imageName}:${IMAGE_TAG}
                       docker push ${targetRegistry}/${imageName}:${IMAGE_TAG}"""