codec2: fix build

Bug: 116297102
Test: m checkbuild
Change-Id: I9e051fc319515e6f7efd8679cee2635787edd3d9
(cherry picked from commit 4e3677313528027f6b11d59624bd822aa8596f5e)
diff --git a/codec2/hidl/1.0/mts/common/media_c2_hidl_test_common.h b/codec2/hidl/1.0/mts/common/media_c2_hidl_test_common.h
index 89e4abd..0e7db26 100644
--- a/codec2/hidl/1.0/mts/common/media_c2_hidl_test_common.h
+++ b/codec2/hidl/1.0/mts/common/media_c2_hidl_test_common.h
@@ -50,10 +50,12 @@
         : callBack(fn) {}
     virtual void onWorkDone(
         const std::weak_ptr<android::Codec2Client::Component>& comp,
-        std::list<std::unique_ptr<C2Work>>& workItems) override {
+        std::list<std::unique_ptr<C2Work>>& workItems,
+        size_t numDiscardedInputBuffers) override {
         /* TODO */
         ALOGD("onWorkDone called");
         (void)comp;
+        (void)numDiscardedInputBuffers;
         if (callBack) callBack(workItems);
     }