fixup! pack: Clear all non-current entries after pack

Take review feedback by @jamadden into account

- ret -> result
- use () for tuples uniformly
- no vertical alignment

src/ZEO/ClientStorage.py

@@ -559,7 +559,7 @@ class ClientStorage(ZODB.ConflictResolution.ConflictResolvingStorage):
         if t is None:
             t = time.time()
         t = t - (days * 86400)
-        ret = self._call('pack', t, wait)
+        result = self._call('pack', t, wait)
         # remove all non-current entries from the cache.
         # This way we make sure that loadBefore with before < packtime, won't
         # return data from the cache, instead of returning "no data" if requested object
@@ -568,7 +568,7 @@ class ClientStorage(ZODB.ConflictResolution.ConflictResolvingStorage):
         # cache than is strictly necessary, but since access to noncurrent data
         # is seldom, that should not cause problems in practice.
         self._cache.clearAllNonCurrent()
-        return ret
+        return result
 
     def store(self, oid, serial, data, version, txn):
         """Storage API: store data for an object."""

src/ZEO/cache.py

@@ -250,7 +250,7 @@ class ClientCache(object):
     def clearAllNonCurrent(self):
         with self._lock:
             f = self.f
-            for oid, tidofs in self.noncurrent.items():
+            for (oid, tidofs) in self.noncurrent.items():
                 for (tid, ofs) in tidofs.items():
                     f.seek(ofs)
                     status = f.read(1)