Fix dss/mmap allocation precedence code.

Fix dss/mmap allocation precedence code to use recyclable mmap memory
only after primary dss allocation fails.
diff --git a/ChangeLog b/ChangeLog
index 0ae4f11..9a61872 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,12 @@
     http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git
     git://canonware.com/jemalloc.git
 
+* 3.x.x (XXX Not released)
+
+  Bug fixes:
+  - Fix dss/mmap allocation precedence code to use recyclable mmap memory only
+    after primary dss allocation fails.
+
 * 3.1.0 (October 16, 2012)
 
   New features: