liboverlay: ensure open fd's are always closed

Ensures that reset and  mFd.Close is always called when MdpCtrl
and MdpData are closed down.

Acked-by: Arun Kumar K.R <akumarkr@codeaurora.org>
Change-Id: I775ba7cfe45c67e6acf874e3f4e8b4fa6fbe33b8
diff --git a/liboverlay/overlayMdp.h b/liboverlay/overlayMdp.h
index 1ccd64b..695657b 100644
--- a/liboverlay/overlayMdp.h
+++ b/liboverlay/overlayMdp.h
@@ -463,12 +463,8 @@
 }
 
 inline bool MdpData::close() {
-    if(-1 == mOvData.data.memory_id) return true;
     reset();
-    if(!mFd.close()) {
-        return false;
-    }
-    return true;
+    return mFd.close();
 }
 
 inline int MdpData::getSrcMemoryId() const { return mOvData.data.memory_id; }