Additional changes for b/5081725 as per code review by Jeff Tinker. Missed allocating buffer for HLS case.

BUG: 5081725

Change-Id: I21439a5dcce38102a943ade966b5fa79f3d1a686

proprietary/wvm/WVMMediaSource.cpp

@@ -123,6 +123,10 @@ status_t WVMMediaSource::start(MetaData *)
 
 #ifndef REQUIRE_SECURE_BUFFERS
         allocBufferGroup();
+#else
+        if (mIsLiveStream) {
+            allocBufferGroup();
+        }
 #endif
     } else {
         // audio