Fix typos in releaser script

tools/scripts/releaser/releaser

@@ -173,8 +173,8 @@ function do_update() {
     cd $workdir/$version/export
     # create sql upgrade file
     tpl="CRM/Upgrade/Incremental/sql/$new_ver.mysql.tpl"
-    if [ -f tpl ]; then
-      echo "{* file to handle db changes in $new_ver during upgrade *}" >> $tpl
+    if [ ! -f $tpl ]; then
+      echo "{* file to handle db changes in $new_ver during upgrade *}" > $tpl
     fi
     # escape regex special chars
     arg=`echo "$version" | sed 's:[]\[\^\$\.\*\/]:\\\\&:g'`