Add missing includes.

Change-Id: Ia74cceea707e51195a570eed37d4b334ac413773
diff --git a/modules/hwcomposer/hwcomposer.cpp b/modules/hwcomposer/hwcomposer.cpp
index f0a5512..9d1aa34 100644
--- a/modules/hwcomposer/hwcomposer.cpp
+++ b/modules/hwcomposer/hwcomposer.cpp
@@ -16,8 +16,9 @@
 
 #include <hardware/hardware.h>
 
-#include <fcntl.h>
 #include <errno.h>
+#include <fcntl.h>
+#include <malloc.h>
 
 #include <cutils/log.h>
 #include <cutils/atomic.h>