It doesn't belong there.

This makes the extension of the registered item available at evaluation time,
which is e.g. needed to access the extension context.

plugins: doveadm-sieve: doveadm-sieve-sync - Refactor error handling in sieve_attribute_set_active()

Was handled in each extension before, which is useless.

lib-sieve: plugins: environment: Use int for sieve_ext_environment_require_extension() status result