d/changelog: Add missing colon

Signed-off-by: Niels Thykier <niels@thykier.net>
c/cruft: Use "return" instead of "next" to exit sub

Signed-off-by: Niels Thykier <niels@thykier.net>
L::C::Source: Add source specific "is_non_free" method

Signed-off-by: Niels Thykier <niels@thykier.net>