remove redundant describe block

spec/inspect_spec.lua

@@ -59,11 +59,9 @@ describe( 'inspect', function()
   end)
 
   if is_luajit then
-    describe('luajit cdata', function()
     it('works with luajit cdata', function()
       assert.equals(inspect({ ffi.new("int", 1), ffi.typeof("int"), ffi.typeof("int")(1) }), '{ <cdata 1>, <cdata 2>, <cdata 3> }')
     end)
-    end)
   end
 
   describe('tables', function()