Set ATRACE_ENABLE() to '0' if not availble

Change-Id: Iec61d275cd7b2be65f828c282f97cc59adf4cc0b
diff --git a/include/cutils/trace.h b/include/cutils/trace.h
index fbb6077..a0dd1e0 100644
--- a/include/cutils/trace.h
+++ b/include/cutils/trace.h
@@ -263,7 +263,7 @@
 
 #define ATRACE_INIT()
 #define ATRACE_GET_ENABLED_TAGS()
-#define ATRACE_ENABLED()
+#define ATRACE_ENABLED() 0
 #define ATRACE_BEGIN(name)
 #define ATRACE_END()
 #define ATRACE_ASYNC_BEGIN(name, cookie)