Shut up some Mac (xcode 3) warnings

Review URL: http://codereview.appspot.com/6503053/



git-svn-id: http://skia.googlecode.com/svn/trunk@5402 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index c4c2edf..5e1bd36 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -159,9 +159,9 @@
         return false;
     }
 
+#if GR_SW_CLIP
     bool requiresAA = requires_AA(*clipDataIn->fClipStack);
 
-#if GR_SW_CLIP
     // If MSAA is enabled we can do everything in the stencil buffer.
     // Otherwise check if we should just create the entire clip mask
     // in software (this will only happen if the clip mask is anti-aliased