ultrahdr: fix initialization in enc fuzzer

Bug: 294709564
Test: ./ultrahdr_enc_fuzzer

Change-Id: I67a5274bc69c9f7d7222faebca73127757ecab7f
diff --git a/libs/ultrahdr/fuzzer/ultrahdr_enc_fuzzer.cpp b/libs/ultrahdr/fuzzer/ultrahdr_enc_fuzzer.cpp
index bf9b031..c536c39 100644
--- a/libs/ultrahdr/fuzzer/ultrahdr_enc_fuzzer.cpp
+++ b/libs/ultrahdr/fuzzer/ultrahdr_enc_fuzzer.cpp
@@ -207,7 +207,7 @@
                 fill420Buffer(bufferYSdr.get(), width, height, yStride);
                 size_t yuv420UVSize = uvStride * yuv420Img.height / 2 * 2;
                 bufferUVSdr = std::make_unique<uint8_t[]>(yuv420UVSize);
-                yuv420Img.chroma_data = bufferYSdr.get();
+                yuv420Img.chroma_data = bufferUVSdr.get();
                 yuv420Img.chroma_stride = uvStride;
                 fill420Buffer(bufferUVSdr.get(), width / 2, height / 2, uvStride);
                 fill420Buffer(bufferUVSdr.get() + uvStride * height / 2, width / 2, height / 2,