go.tools/go/types/typemap: fix formatting verb
go.tools/go/types/typemap: fix formatting verb

(%p is trouble if the interface value is not a pointer)

R=adonovan
CC=golang-dev
https://codereview.appspot.com/41440043

d0f/go-zh.tools,d0f/go-zh.tools,webfd/go-zh.tools,d0f/go-zh.tools,d0f/go-zh.tools,skyportsystems/go.tools,webfd/go-zh.tools,8limbs/gotools,skyportsystems/go.tools,webfd/go-zh.tools,bryanxu/go-zh.tools,skyportsystems/go.tools,webfd/go-zh.tools,8limbs/gotools,bryanxu/go-zh.tools,bryanxu/go-zh.tools,skyportsystems/go.tools,8limbs/gotools,webfd/go-zh.tools,skyportsystems/go.tools,d0f/go-zh.tools,bryanxu/go-zh.tools,bryanxu/go-zh.tools