update duplicate sources: exit when clone fails

update_duplicate_sources

@@ -31,7 +31,7 @@
 if [ -e ".hg" ]; then
     branch="$(hg id -b)"
     tags=($(hg id -t))
-    hg clone ssh://hg@bitbucket.org/xcg/${source_name}
+    hg clone ssh://hg@bitbucket.org/xcg/${source_name} || exit 1
     pushd $source_name
     hg update $branch
     branch_exist=$?