Fix rtp build error.

Change-Id: Ibf508e131362e238d4b8c43964e0ec8bb6092a14
diff --git a/mbtk/mbtk_rtpd/src/main.c b/mbtk/mbtk_rtpd/src/main.c
index b8eec79..d09098c 100755
--- a/mbtk/mbtk_rtpd/src/main.c
+++ b/mbtk/mbtk_rtpd/src/main.c
@@ -375,7 +375,7 @@
     return -1;
 }
 
-#ifdef MBTK_DEV_INFO_VERSION_2
+#ifdef MBTK_SOURCE_VERSION_2
 static void call_state_change_cb(const void* data, int data_len)
 {
     if(data) {