No error if function marked with SK_WARN_UNUSED_RESULT is used in SkAssertResult

include/core/SkTypes.h

Index: include/core/SkTypes.h
diff --git a/include/core/SkTypes.h b/include/core/SkTypes.h
index f99bb019498a5c15db390d668f34f67fb5811df9..b44df0de485056969550fc0428374f7d25ee6315 100644
--- a/include/core/SkTypes.h
+++ b/include/core/SkTypes.h
@@ -148,8 +148,9 @@ inline void operator delete(void* p) {
     #define SkDECLAREPARAM(type, var)
     #define SkPARAM(var)
 
-    // unlike SkASSERT, this guy executes its condition in the non-debug build
-    #define SkAssertResult(cond)        cond
+    // unlike SkASSERT, this guy executes its condition in the non-debug build.
+    // It casts to void to allow use with functions declared with SK_WARN_RESULT_UNUSED.
+    #define SkAssertResult(cond)        (void)(cond)
 #endif
 
 // Legacy macro names for SK_ABORT