minor code cleanup

Cython/Compiler/ExprNodes.py

@@ -1832,8 +1832,6 @@ class IteratorNode(ExprNode):
                 "if (PyList_CheckExact(%s) || PyTuple_CheckExact(%s)) {" % (
                     self.sequence.py_result(),
                     self.sequence.py_result()))
-        if not is_builtin_sequence:
-            self.iter_func_ptr = code.funcstate.allocate_temp(self._func_iternext_type, manage_ref=False)
         if is_builtin_sequence or self.may_be_a_sequence:
             code.putln(
                 "%s = 0; %s = %s; __Pyx_INCREF(%s);" % (
@@ -1841,10 +1839,10 @@ class IteratorNode(ExprNode):
                     self.result(),
                     self.sequence.py_result(),
                     self.result()))
-            if self.iter_func_ptr:
-                code.putln("%s = NULL;" % self.iter_func_ptr)
         if not is_builtin_sequence:
+            self.iter_func_ptr = code.funcstate.allocate_temp(self._func_iternext_type, manage_ref=False)
             if self.may_be_a_sequence:
+                code.putln("%s = NULL;" % self.iter_func_ptr)
                 code.putln("} else {")
             code.putln("%s = -1; %s = PyObject_GetIter(%s); %s" % (
                     self.counter_cname,