autopkgtest.py: Update previous commit to match recent changes

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

britney2/policies/autopkgtest.py

@@ -530,7 +530,7 @@ class AutopkgtestPolicy(BasePolicy):
         if src.startswith('gcc-'):
             if re.match('gcc-\d$', src):
                 # add gcc's own tests, if it has any
-                srcinfo = self.britney.sources['unstable'][src]
+                srcinfo = source_suite.sources[src]
                 if 'autopkgtest' in srcinfo.testsuite:
                     tests.append((src, ver))
                 for test in ['binutils', 'fglrx-installer', 'libreoffice', 'linux']: