Fix an instance of -Wunused-but-set-variable.

Bug: chromium:1203071
Change-Id: I1cdd65c735dcc30a50cf4cdd4a63b309d3bc5a90
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/432738
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
diff --git a/src/utils/win/SkDWriteFontFileStream.cpp b/src/utils/win/SkDWriteFontFileStream.cpp
index a3448d3..266e6fa 100644
--- a/src/utils/win/SkDWriteFontFileStream.cpp
+++ b/src/utils/win/SkDWriteFontFileStream.cpp
@@ -111,9 +111,8 @@
 }
 
 size_t SkDWriteFontFileStream::getLength() const {
-    HRESULT hr = S_OK;
     UINT64 realFileSize = 0;
-    hr = fFontFileStream->GetFileSize(&realFileSize);
+    fFontFileStream->GetFileSize(&realFileSize);
     if (!SkTFitsIn<size_t>(realFileSize)) {
         return 0;
     }