Camera: fix unknown bufId issue

It's legit to have bufId 0 in processCaptureResult with HAL buffer
manager, but not for returnStreamBuffers.

Test: the failed test can now pass
Bug: 135565913
Change-Id: I05947bc159bb9ba00a670b98d4622f685b4ac760

camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp

@@ -1233,7 +1233,14 @@ bool CameraHidlTest::DeviceCb::processCaptureResultLocked(const CaptureResult& r
     }
 
     if (mUseHalBufManager) {
-        returnStreamBuffers(results.outputBuffers);
+        // Don't return buffers of bufId 0 (empty buffer)
+        std::vector<StreamBuffer> buffers;
+        for (const auto& sb : results.outputBuffers) {
+            if (sb.bufferId != 0) {
+                buffers.push_back(sb);
+            }
+        }
+        returnStreamBuffers(buffers);
     }
     return notify;
 }