bisect-kit: fix lint warnings

BUG=None
TEST=pylint

Change-Id: I218d1bd07ce8583c5f98569b4b26c80b318781c9
diff --git a/bisect_kit/codechange.py b/bisect_kit/codechange.py
index 3aadf79..8e14171 100644
--- a/bisect_kit/codechange.py
+++ b/bisect_kit/codechange.py
@@ -864,8 +864,7 @@
           logger.error('essential spec mismatch, unable to continue')
           raise ValueError('Commit history analyze failed. '
                            'Bisector cannot deal with this version range.')
-        else:
-          logger.warning('%s do not match, skip', fixed_spec.name)
+        logger.warning('%s do not match, skip', fixed_spec.name)
         continue
       result.append((i, matched_index))
       last_index = matched_index