Fix a case of kPartialSuccess.

src/images/SkImageDecoder_libjpeg.cpp

Index: src/images/SkImageDecoder_libjpeg.cpp
diff --git a/src/images/SkImageDecoder_libjpeg.cpp b/src/images/SkImageDecoder_libjpeg.cpp
index 18e71fad3bb536249d73f2db85532265925ff0eb..e6bc8827cd05d0f894ec48a70882e2a5d30ce81f 100644
--- a/src/images/SkImageDecoder_libjpeg.cpp
+++ b/src/images/SkImageDecoder_libjpeg.cpp
@@ -724,7 +724,7 @@ SkImageDecoder::Result SkJPEGImageDecoder::onDecode(SkStream* stream, SkBitmap*
             fill_below_level(y, bm);
             cinfo.output_scanline = cinfo.output_height;
             jpeg_finish_decompress(&cinfo);
-            return kSuccess;
+            return kPartialSuccess;
         }
         if (this->shouldCancelDecode()) {
             return return_failure(cinfo, *bm, "shouldCancelDecode");