Provide refname for failed update as well.

Ran java formatter.

Change-Id: I0bc094115430c2780f1eac6dfdd9da2af79b94fa

src/main/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java b/src/main/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java
index 1d1a33e..c24b717 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java
@@ -56,8 +56,6 @@
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
-import org.eclipse.jgit.revwalk.RevWalk;
-import org.eclipse.jgit.treewalk.TreeWalk;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -332,11 +330,12 @@
       try {
         update(c, event.getRefName());
       } catch (IOException | GitAPIException e) {
-        // We are in an asynchronously called listener, so there is no user action
-        // to give feedback to. We log the error, but it would be nice if we could surface
-        // these logs somewhere.
-        // Perhaps we could store these as commits in some special branch (but in what repo?).
-        log.error("update for " + c.toString() + " failed: ", e);
+        // We are in an asynchronously called listener, so there is no user action to give
+        // feedback to. We log the error, but it would be nice if we could surface these logs
+        // somewhere.  Perhaps we could store these as commits in some special branch (but in
+        // what repo?).
+        log.error(
+            String.format("update for %s (ref %s) failed", c.toString(), event.getRefName()), e);
       }
     }
   }