driver: unify monitor match-parsing
driver: unify monitor match-parsing

Rather than parsing the fallback in a separate step, unify both
code-pathes. This reduces the number of call-sites, and thus makes sure
our error-handling is always the same.

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@gmail.com>

bus1/dbus-broker