ARM: Fix wrong fall through handling

Looks like a copy/paste mistake.

R=kmillikin@chromium.org

BUG=
TEST=

Review URL: http://codereview.chromium.org//6826031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7564 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/full-codegen-arm.cc

@@ -432,7 +432,6 @@ void FullCodeGenerator::TestContext::Plug(Handle<Object> lit) const {
   } else if (lit->IsString()) {
     if (String::cast(*lit)->length() == 0) {
       if (false_label_ != fall_through_) __ b(false_label_);
-      __ b(false_label_);
     } else {
       if (true_label_ != fall_through_) __ b(true_label_);
     }