Correct ObjectWalk error message when bad object is found

Instead of including "ObjectId[SHA-1]" in the message, just
us the formatted SHA-1 name of the object by calling name().

Change-Id: I0d1d0e8207f8a3f02188e60242e4e9bf7420e88f
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/ObjectWalk.java

@@ -283,9 +283,9 @@ public RevObject nextObject() throws MissingObjectException,
 					break;
 				treeWalk.getEntryObjectId(idBuffer);
 				throw new CorruptObjectException("Invalid mode " + mode
-						+ " for " + idBuffer.name() + " "
-						+ treeWalk.getEntryPathString() + " in " + currentTree
-						+ ".");
+						+ " for " + idBuffer.name() + " '"
+						+ treeWalk.getEntryPathString() + "' in "
+						+ currentTree.name() + ".");
 			}
 
 			treeWalk = treeWalk.next();