Fix some problems reported by clang static analyzer

Source/core/rendering/RenderBlockLineLayout.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 901 matching lines @@
         // tree to see which parent inline is the isolate. We could change enterIsolate
         // to take a RenderObject and do this logic there, but that would be a layering
         // violation for BidiResolver (which knows nothing about RenderObject).
         RenderInline* isolatedInline = toRenderInline(highestContainingIsolateWithinRoot(startObj, currentRoot));
         ASSERT(isolatedInline);
 
         InlineBidiResolver isolatedResolver;
         LineMidpointState& isolatedLineMidpointState = isolatedResolver.midpointState();
         isolatedLineMidpointState = topResolver.midpointStateForIsolatedRun(isolatedRun);
         EUnicodeBidi unicodeBidi = isolatedInline->style()->unicodeBidi();
-        TextDirection direction = isolatedInline->style()->direction();
+        TextDirection direction;
         if (unicodeBidi == Plaintext) {
             if (isNewUBAParagraph)
                 direction = determinePlaintextDirectionality(isolatedInline, startObj);
             else
                 direction = determinePlaintextDirectionality(isolatedInline);
         } else {
             ASSERT(unicodeBidi == Isolate || unicodeBidi == IsolateOverride);
             direction = isolatedInline->style()->direction();
         }
         isolatedResolver.setStatus(statusWithDirection(direction, isOverride(unicodeBidi)));
@@ skipping 1482 matching lines @@
     lineGridBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache);
 
     setLineGridBox(lineGridBox);
 
     // FIXME: If any of the characteristics of the box change compared to the old one, then we need to do a deep dirtying
     // (similar to what happens when the page height changes). Ideally, though, we only do this if someone is actually snapping
     // to this grid.
 }
 
 }