When I switched from using stack allocated space for printf, I missed a case

When I switched from using stack allocated space for printf, I missed a case
where a sizeof(foo) was changed to the sizeof a pointer.  This caused
_dl_printf to complain a lot when debug is enabled (which itself revealed a bug
since it should have exited on buffer overflow), and let me to find another
bug, where memory failures would try to recursively call _dl_printf....
What a mess.