iseq.c (rb_iseq_mark): reduce NULL checks

iseq_location_setup always sets path, label and base_label fields,
and the only caller of iseq_location_setup (prepare_iseq_build) will
always pass non-nil `name' and `path' arguments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51581 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sat Aug 15 04:16:13 2015  Eric Wong  <e@80x24.org>
+
+	* iseq.c (rb_iseq_mark): reduce NULL checks
+
 Fri Aug 14 18:50:57 2015  Eric Wong  <e@80x24.org>
 
 	* method.h (METHOD_ENTRY_VISI_SET): cast visi to int

iseq.c

@@ -108,9 +108,9 @@ rb_iseq_mark(const rb_iseq_t *iseq)
 	const struct rb_iseq_constant_body *body = iseq->body;
 
 	RUBY_MARK_UNLESS_NULL(body->mark_ary);
-	RUBY_MARK_UNLESS_NULL(body->location.label);
-	RUBY_MARK_UNLESS_NULL(body->location.base_label);
-	RUBY_MARK_UNLESS_NULL(body->location.path);
+	rb_gc_mark(body->location.label);
+	rb_gc_mark(body->location.base_label);
+	rb_gc_mark(body->location.path);
 	RUBY_MARK_UNLESS_NULL(body->location.absolute_path);
     }