fix warning related to && and || and parens

git-svn-id: http://skia.googlecode.com/svn/trunk@9597 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/views/SkView.cpp b/src/views/SkView.cpp
index 9c3e50f..b1bdb25 100644
--- a/src/views/SkView.cpp
+++ b/src/views/SkView.cpp
@@ -783,7 +783,7 @@
     } else {
         bool nextNull = NULL == fNextSibling;
         bool prevNull = NULL == fNextSibling;
-        SkASSERT(nextNull && prevNull || !nextNull && !prevNull);
+        SkASSERT(nextNull == prevNull);
     }
 }