GenericSource: reset mDecryptHandle when mDataSource is cleared.

Bug: 25070434
Change-Id: Ib0eb6a419683a0e686a4f63b82e9300cb1f69484
diff --git a/media/libmediaplayerservice/nuplayer/GenericSource.cpp b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
index 42fcb5b..45da218 100644
--- a/media/libmediaplayerservice/nuplayer/GenericSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
@@ -474,6 +474,7 @@
             {
                 Mutex::Autolock _l(mDisconnectLock);
                 mDataSource.clear();
+                mDecryptHandle = NULL;
                 mDrmManagerClient = NULL;
                 mCachedSource.clear();
                 mHttpSource.clear();