travis-ci: don't repeat the path of the cache directory

diff --git a/ci/run-tests.sh b/ci/run-tests.sh
index 22355f0091a0a3936472179249cf152d9f20fc17..deba73d9b59820dd2ad427bbd39fa8afb3a21ef2 100755 (executable)
--- a/ci/run-tests.sh
+++ b/ci/run-tests.sh
@@ -5,7 +5,8 @@
 
 . ${0%/*}/lib-travisci.sh
 
-ln -s $HOME/travis-cache/.prove t/.prove
+ln -s "$cache_dir/.prove" t/.prove
+
 make --quiet test
 
 check_unignored_build_artifacts