fix warnings (failed to return a bool)



git-svn-id: http://skia.googlecode.com/svn/trunk@2455 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkAAClip.cpp b/src/core/SkAAClip.cpp
index 0dbdd0f..2955b61 100644
--- a/src/core/SkAAClip.cpp
+++ b/src/core/SkAAClip.cpp
@@ -234,6 +234,7 @@
         clip.op(iter.rect(), SkRegion::kUnion_Op);
     }
     this->swap(clip);
+    return !this->isEmpty();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -530,7 +531,7 @@
         { unexpected(); }
 
     virtual const SkBitmap* justAnOpaqueColor(uint32_t*) SK_OVERRIDE {
-        return false;
+        return NULL;
     }
 
     virtual void blitH(int x, int y, int width) SK_OVERRIDE {
@@ -593,7 +594,8 @@
     fBounds = ibounds;
     fRunHead = builder.finish();
 
-    builder.dump();
+    //builder.dump();
+    return !this->isEmpty();
 }
 
 ///////////////////////////////////////////////////////////////////////////////