avoid generating some unreachable code on function exit

Cython/Compiler/Nodes.py

@@ -1799,6 +1799,7 @@ class FuncDefNode(StatNode, BlockNode):
         code.putln("/* function exit code */")
 
         # ----- Default return value
+        if not self.body.is_terminator:
             if self.return_type.is_pyobject:
                 #if self.return_type.is_extension_type:
                 #    lhs = "(PyObject *)%s" % Naming.retval_cname
@@ -1811,6 +1812,7 @@ class FuncDefNode(StatNode, BlockNode):
                     code.putln("%s = %s;" % (Naming.retval_cname, val))
         # ----- Error cleanup
         if code.error_label in code.labels_used:
+            if not self.body.is_terminator:
                 code.put_goto(code.return_label)
             code.put_label(code.error_label)
             for cname, type in code.funcstate.all_managed_temps():