interceptor: tidy up default_make_relative

This removes some outstanding code smells identified in aosp/1898997.
Some correctness fixes, some cleanups.

Bug: 207620569
Signed-off-by: Matthias Maennich <maennich@google.com>
Change-Id: Ic31b2ac1ef18b2a93b99dc2e303f7c6ccd66d1d6
1 file changed