Bug 537873: Avoid writing past the end of ScriptObjectFixture::uc_code. r=jorendorff

This silences a warning when building testScriptObject.o under GCC -O3.

js/src/jsapi-tests/testScriptObject.cpp

@@ -11,7 +11,7 @@ struct ScriptObjectFixture : public JSAPITest {
 
     ScriptObjectFixture()
     {
-        for (int i = 0; i <= code_size; i++)
+        for (int i = 0; i < code_size; i++)
             uc_code[i] = code[i];
     }