ccan/list/list.h: suppress unused argument warnings

ccan commit 6aaca17e07588997417a73fac19dcf0ff17ed81b
("list: suppress unused argument warnings")
by Cody P Shafer.

Signed-off-by: Cody P Schafer <dev@codyps.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51776 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Sep  6 16:07:22 2015  Eric Wong  <e@80x24.org>
+
+	* ccan/list/list.h: suppress unused argument warnings
+	  [ccan commit 6aaca17e07588997417a73fac19dcf0ff17ed81b]
+
 Sat Sep  5 11:39:52 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/rss/rss.rb (Time#w3cdtf): fix zero-trimmed width of fraction

ccan/list/list.h

@@ -42,8 +42,8 @@ struct list_head
 };
 
 #define LIST_LOC __FILE__  ":" stringify(__LINE__)
-#define list_debug(h, loc) (h)
-#define list_debug_node(n, loc) (n)
+#define list_debug(h, loc) ((void)loc, h)
+#define list_debug_node(n, loc) ((void)loc, n)
 
 /**
  * LIST_HEAD_INIT - initializer for an empty list_head