suiteloader: Don't need to do an 'in' check when adding to a set

britney2/inputs/suiteloader.py

@@ -399,7 +399,6 @@ class DebMirrorLikeSuiteContentLoader(SuiteContentLoader):
                 # source -> binary mapping once. It doesn't matter which
                 # of the versions we include as only the package name and
                 # architecture are recorded.
-                if pkg_id not in srcdist[source].binaries:
                 srcdist[source].binaries.add(pkg_id)
             # if the source package doesn't exist, create a fake one
             else: