function pointer argument name removed

This code:
```
typedef int my_cb(int dst, int len, int dat);
int f(my_cb cb, void *dat);

int f(my_cb cb, void *dat)
{
	return 0;
}
```
produces this output:
```
typedef int my_cb(int dst, int len, int dat);
int f(my_cb *, void * dat);


int f(my_cb *, void * dat)
{
  return 0;
}
```
The argument name is removed on the first argument `cb`.