Fix texture allocation in SWMaskHelper

src/gpu/GrClipMaskManager.cpp

Index: src/gpu/GrClipMaskManager.cpp
===================================================================
--- src/gpu/GrClipMaskManager.cpp	(revision 10193)
+++ src/gpu/GrClipMaskManager.cpp	(working copy)
@@ -993,7 +993,7 @@
         }
     }
 
-    helper.toTexture(result, kAllIn_InitialState == initialState ? 0xFF : 0x00);
+    helper.toTexture(result);
 
     fCurrClipMaskType = kAlpha_ClipMaskType;
     return result;