Unify error/status codes

Change-Id: Ib90cc2f2adc07ff146256931c92c0ec4becb86f5
diff --git a/media/ndk/NdkMediaFormat.cpp b/media/ndk/NdkMediaFormat.cpp
index e1d8c95..77018ec 100644
--- a/media/ndk/NdkMediaFormat.cpp
+++ b/media/ndk/NdkMediaFormat.cpp
@@ -64,10 +64,10 @@
 }
 
 EXPORT
-int AMediaFormat_delete(AMediaFormat *mData) {
+media_status_t AMediaFormat_delete(AMediaFormat *mData) {
     ALOGV("dtor");
     delete mData;
-    return OK;
+    return AMEDIA_OK;
 }