diff --git a/gitdb/pack.py b/gitdb/pack.py
@@ -267,8 +267,6 @@ def close(self):
    def _set_cache_(self, attr):
        if attr == "_packfile_checksum":
            self._packfile_checksum = self._cursor.map()[-40:-20]
-        elif attr == "_packfile_checksum":
-            self._packfile_checksum = self._cursor.map()[-20:]
        elif attr == "_cursor":
            # Note: We don't lock the file when reading as we cannot be sure
            # that we can actually write to the location - it could be a read-only
@@ -848,7 +846,6 @@ def is_valid_stream(self, sha, use_crc=False):
            assert shawriter.sha(as_hex=False) == sha
            return shawriter.sha(as_hex=False) == sha
        # END handle crc/sha verification
-        return True

    def info_iter(self):
        """