Clean up Skia for Clang's -Wtautological-undefined-compare

src/core/SkPaint.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPaint.h"
 #include "SkAnnotation.h"
 #include "SkAutoKern.h"
@@ skipping 88 matching lines @@
     fHinting      = SkPaintDefaults_Hinting;
 
     fDirtyBits    = 0;
 #ifdef SK_BUILD_FOR_ANDROID
     new (&fPaintOptionsAndroid) SkPaintOptionsAndroid;
     fGenerationID = 0;
 #endif
 }
 
 SkPaint::SkPaint(const SkPaint& src) {
-    // Diagnoistic. May remove later. See crbug.com/364224
-    if (NULL == &src) {
-        sk_throw();
-    }
-
 #define COPY(field) field = src.field
 #define REF_COPY(field) field = SkSafeRef(src.field)
 
     REF_COPY(fTypeface);
     REF_COPY(fPathEffect);
     REF_COPY(fShader);
     REF_COPY(fXfermode);
     REF_COPY(fMaskFilter);
     REF_COPY(fColorFilter);
     REF_COPY(fRasterizer);
@@ skipping 2610 matching lines @@
     }
 #ifdef SK_BUILD_FOR_ANDROID
     if (dirty & kPaintOptionsAndroid_DirtyBit) {
         SkPaintOptionsAndroid options;
         options.unflatten(buffer);
         paint->setPaintOptionsAndroid(options);
     }
 #endif
     SkASSERT(dirty == paint->fDirtyBits);
 }