helpers: Simplify xfce-update-news

In my tests this works fine, unless I'm missing something
I don't see a reason for writing to files.

helpers/xfce-update-news

@@ -3,28 +3,17 @@
 COMPONENT=$1
 VERSION=$2
 WRITE_TAG=$3
-LAST_TAG=$(git describe  --abbrev=0)
-RELEASE_NOTES="/tmp/release_notes"
-TRANSLATIONS="/tmp/translations"
-
-# Push the release notes and translations text to tmp files
-xfce-get-release-notes $LAST_TAG silent > $RELEASE_NOTES
-xfce-get-translations "$LAST_TAG" "HEAD" silent > $TRANSLATIONS
-
-cleanup () {
-    rm $RELEASE_NOTES
-    rm $TRANSLATIONS
-}
+LAST_TAG=$(git describe --abbrev=0)
+RELEASE_NOTES=$(xfce-get-release-notes "$LAST_TAG" silent)
+TRANSLATIONS=$(xfce-get-translations "$LAST_TAG" "HEAD" silent)
 
 # Check if there is a NEWS file
 if [ "$WRITE_TAG" = "WRITETAG" ]; then
-    printf '%s\n\n%s\n%s\n' $VERSION "$(cat $RELEASE_NOTES)" "$(cat $TRANSLATIONS)"
+    printf '%s\n\n%s\n%s\n' $VERSION "$RELEASE_NOTES" "$TRANSLATIONS"
 elif [ ! -f "NEWS" ]; then
     echo "There is no 'NEWS' file. Changelog since $VERSION:"
-    printf '%s\n======\n%s\n%s\n\n%s' $VERSION "$(cat $RELEASE_NOTES)" "$(cat $TRANSLATIONS)"
-    cleanup
+    printf '%s\n======\n%s\n%s\n\n%s' $VERSION "$RELEASE_NOTES" "$TRANSLATIONS"
 else
-    printf '%s\n======\n%s\n%s\n\n%s\n' $VERSION "$(cat $RELEASE_NOTES)" "$(cat $TRANSLATIONS)" "$(cat NEWS)" > NEWS
-    cleanup
+    printf '%s\n======\n%s\n%s\n\n%s\n' $VERSION "$RELEASE_NOTES" "$TRANSLATIONS" "$(cat NEWS)" > NEWS
     git diff NEWS
 fi