remove 2 redundant calls to rb_str_dup

Because `rb_class_path` calls `rb_str_dup` already.

Closes: https://github.com/ruby/ruby/pull/2232

1 files changed, 1 insertions, 1 deletions

diff --git a/object.c b/object.c
index 00a70898f3..17964bb5c8 100644
--- a/object.c
+++ b/object.c
@@ -1800,7 +1800,7 @@ rb_mod_to_s(VALUE klass)
 	rb_str_cat2(s, ">");
 	return s;
     }
-    return rb_str_dup(rb_class_name(klass));
+    return rb_class_name(klass);
 }
 
 /*