ChangesByProjectCacheImpl: Fix typo with originalSubject

This was supposed to be using the length of the originalSubject when it
was different from the subject, but a likely copy/paste error had it
using the length of the subject again.

Change-Id: I4dd18dfb9662e76b8e9fc85c29fdc022b6d58af3
Release-Notes: skip

java/com/google/gerrit/server/git/ChangesByProjectCacheImpl.java

diff --git a/java/com/google/gerrit/server/git/ChangesByProjectCacheImpl.java b/java/com/google/gerrit/server/git/ChangesByProjectCacheImpl.java
index 66c63c6..f954b81 100644
--- a/java/com/google/gerrit/server/git/ChangesByProjectCacheImpl.java
+++ b/java/com/google/gerrit/server/git/ChangesByProjectCacheImpl.java
@@ -301,7 +301,9 @@
       size += JavaWeights.REFERENCE + (c.getTopic() == null ? 0 : c.getTopic().length());
       size +=
           JavaWeights.REFERENCE
-              + (c.getOriginalSubject().equals(c.getSubject()) ? 0 : c.getSubject().length());
+              + (c.getOriginalSubject().equals(c.getSubject())
+                  ? 0
+                  : c.getOriginalSubject().length());
       size +=
           JavaWeights.REFERENCE + (c.getSubmissionId() == null ? 0 : c.getSubmissionId().length());
       size += JavaWeights.REFERENCE + JavaWeights.BOOLEAN; // isPrivate;