StreamingSource: check mTSParser before dereferencing it.

Bug: 18532335
Change-Id: I7819d8d359fe75ea4c827138e9aaa2454ccfe3b1
diff --git a/media/libmediaplayerservice/nuplayer/StreamingSource.cpp b/media/libmediaplayerservice/nuplayer/StreamingSource.cpp
index 27f5159..e54f5b9 100644
--- a/media/libmediaplayerservice/nuplayer/StreamingSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/StreamingSource.cpp
@@ -139,6 +139,10 @@
 }
 
 sp<MetaData> NuPlayer::StreamingSource::getFormatMeta(bool audio) {
+    if (mTSParser == NULL) {
+        return NULL;
+    }
+
     ATSParser::SourceType type =
         audio ? ATSParser::AUDIO : ATSParser::VIDEO;