unpack-trees: rename 'new' variables

Rename C++ keyword in order to bring the codebase closer to being able
to be compiled with a C++ compiler.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

unpack-trees.c

@@ -194,10 +194,10 @@ static int do_add_entry(struct unpack_trees_options *o, struct cache_entry *ce,
 static struct cache_entry *dup_entry(const struct cache_entry *ce)
 {
 	unsigned int size = ce_size(ce);
-	struct cache_entry *new = xmalloc(size);
+	struct cache_entry *new_entry = xmalloc(size);
 
-	memcpy(new, ce, size);
-	return new;
+	memcpy(new_entry, ce, size);
+	return new_entry;
 }
 
 static void add_entry(struct unpack_trees_options *o,