NuPlayerRenderer: intialize bitrate to 0

intialize to 0 instead of -1 intialization
which caused casting error for some of
offload playbacks.
CRs-Fixed: 2888327

Bug: 183461316
Test: make

Change-Id: I8433c40a55de93a56387d1f4099fc884a97a5b33
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
index 6a8c708..4a65f71 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
@@ -1962,7 +1962,7 @@
             ALOGV("Mime \"%s\" mapped to audio_format 0x%x",
                     mime.c_str(), audioFormat);
 
-            int avgBitRate = -1;
+            int avgBitRate = 0;
             format->findInt32("bitrate", &avgBitRate);
 
             int32_t aacProfile = -1;