plugins: doveadm-sieve: doveadm-sieve-cmd-put - Fix script memory leak occurring when saved script is also activated.

lib-sieve: sieve-storage - Fix script memory leak occurring when saved script is implicitly activated.

Add NEWS from releases to master branch too

@@
expression E;
@@

- if (hash_table_is_created(E)) {
-       hash_table_destroy(&E);
- }
+ hash_table_destroy(&E);

lib-sieve: redirect action: Assert that dupeid is not NULL when act_redirect_get_duplicate_id() is successful.

Addresses scan-build report.

lib-sieve: redirect action: Fix lack of NULL checking in new X-Sieve-Redirected-From header comparisons.

Problem found by scan-build.

In this context, it can never be NULL and the check confuses Coverity.

In this context, it can never be NULL and the check confuses Coverity.

Also check the X-Sieve-Redirected-From header for our own e-mail addresses. This
header is added by the redirect action itself and in a mail loop it would see
that same header with that same content. This is less reliable than the other
mail loop detection (sender may set such a header), so, unlike the existing loop
detection based on the duplicate db, the implicit keep is not canceled when the
new loop detection is triggered.

Serves as an abbreviation.