Fix an issue in MPEG4Writer where the write of outstanding chunks in the last batch was missing

Change-Id: I93c9f6ae7ed098cdf828b2b11a9273c9e0c244e3

media/libstagefright/MPEG4Writer.cpp

@@ -1308,6 +1308,7 @@ void MPEG4Writer::writeAllChunks() {
     size_t outstandingChunks = 0;
     Chunk chunk;
     while (findChunkToWrite(&chunk)) {
+        writeChunkToFile(&chunk);
         ++outstandingChunks;
     }