ruby_atomic.h: fix typo

* ruby_atomic.h (ATOMIC_VALUE_CAS): fix typo.
  TODO: make arguments of all CAS macros consistent.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51781 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Sep  7 15:54:58 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ruby_atomic.h (ATOMIC_VALUE_CAS): fix typo.
+	  TODO: make arguments of all CAS macros consistent.
+
 Sun Sep  6 16:07:22 2015  Eric Wong  <e@80x24.org>
 
 	* ccan/list/list.h: suppress unused argument warnings

ruby_atomic.h

@@ -168,7 +168,7 @@ ruby_atomic_size_exchange(size_t *ptr, size_t val)
 #   define ATOMIC_VALUE_EXCHANGE(var, val) ATOMIC_EXCHANGE(var, val)
 # endif
 # ifndef ATOMIC_VALUE_CAS
-#   define ATOMIC_VALUE_CAS(var, oldval, val) ATOMIC_CAS(var, oldval, newval)
+#   define ATOMIC_VALUE_CAS(var, oldval, val) ATOMIC_CAS(var, oldval, val)
 # endif
 #endif