Appease valgrind wrt testing code initialization

The new swarming valgrind bot appears to be higher maintenance. These changes seem harmless and will, hopefully, unblock the bot.

TBR=bsalomon@google.com

https://build.chromium.org/p/client.skia.fyi/builders/Test-Ubuntu-GCC-ShuttleA-GPU-GTX550Ti-x86_64-Release-SwarmingValgrind/builds/57

BUG=skia:5164
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1867053002

Review URL: https://codereview.chromium.org/1867053002
diff --git a/src/pathops/SkPathOpsSimplify.cpp b/src/pathops/SkPathOpsSimplify.cpp
index 08bb26d..97f0350 100644
--- a/src/pathops/SkPathOpsSimplify.cpp
+++ b/src/pathops/SkPathOpsSimplify.cpp
@@ -216,7 +216,7 @@
     result->reset();
     result->setFillType(fillType);
     SkPathWriter wrapper(*result);
-    bool closable;
+    bool closable SK_INIT_TO_AVOID_WARNING;
     if (builder.xorMask() == kWinding_PathOpsMask
             ? !bridgeWinding(contourList, &wrapper, &allocator, &closable)
             : !bridgeXor(contourList, &wrapper, &allocator, &closable)) {