mediaplayer: allow setVideoSurface before setDataSource

Bug: 18709604
Change-Id: I41e4734faed48b5583feb29896cd5783b8cd7e33
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
index d433a4d..080cd52 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
@@ -537,7 +537,7 @@
             sp<RefBase> obj;
             CHECK(msg->findObject("native-window", &obj));
 
-            if (mSource->getFormat(false /* audio */) == NULL) {
+            if (mSource == NULL || mSource->getFormat(false /* audio */) == NULL) {
                 performSetSurface(static_cast<NativeWindowWrapper *>(obj.get()));
                 break;
             }