CommitSoyData: remove no-op assignment from checkNotNull

Change-Id: I28988c1ef372cc9f3ed305a3b0d48e1a17d64c28

gitiles-servlet/src/main/java/com/google/gitiles/CommitSoyData.java

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/CommitSoyData.java b/gitiles-servlet/src/main/java/com/google/gitiles/CommitSoyData.java
index 86e6184..b7ce0c8 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/CommitSoyData.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/CommitSoyData.java
@@ -108,7 +108,7 @@
   public Map<String, Object> toSoyData(HttpServletRequest req, RevCommit commit, KeySet ks)
       throws IOException {
     checkKeys(ks);
-    req = checkNotNull(req, "request");
+    checkNotNull(req, "request");
     repo = ServletUtils.getRepository(req);
     view = ViewFilter.getView(req);