Make path absolute

No that this'll make any difference, but change path to be:
  /jdk8u/jtreg-....

Currently not seeing changes make any difference to generated files.
diff --git a/rewrite-urls b/rewrite-urls
index 42f2adb..13d84b0 100755
--- a/rewrite-urls
+++ b/rewrite-urls
@@ -23,7 +23,7 @@
 : ${TOP_DIR:?"Must specify TOP_DIR (e.g., TOP_DIR=$HOME/openjdk8-aarch64 $progname)"}
 
 d=$(basename $TOP_DIR)
-sed_expr=$(echo s!$TOP_DIR!$JDK_VERSION/$d!g)
+sed_expr=$(echo s!$TOP_DIR!/$JDK_VERSION/$d!g)
 
 find $TOP_DIR/reports -type f -exec perl -p -i -e "$sed_expr" {} \;
 find $TOP_DIR/super-diff -type f -exec perl -p -i -e "$sed_expr" {} \;