Potential fix for SpecialImageTest memory leak

src/core/SkSpecialImage.cpp

Index: src/core/SkSpecialImage.cpp
diff --git a/src/core/SkSpecialImage.cpp b/src/core/SkSpecialImage.cpp
index 03223a2694e8cd91ebafafdb8c5f968491c48246..a5dc4b040be5030972bb5910e9c57f12b1bbcdfb 100644
--- a/src/core/SkSpecialImage.cpp
+++ b/src/core/SkSpecialImage.cpp
@@ -105,7 +105,7 @@ sk_sp<SkSpecialSurface> SkSpecialImage::makeSurface(const SkImageInfo& info) con
 }
 
 sk_sp<SkSurface> SkSpecialImage::makeTightSurface(const SkImageInfo& info) const {
-    sk_sp<SkSurface> tmp(SkRef(as_SIB(this)->onMakeTightSurface(info)));
+    sk_sp<SkSurface> tmp(as_SIB(this)->onMakeTightSurface(info));
     return tmp;
 }